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Yemen’s uprising began on Jan. 27, 2011, when thousands protested in Sanaa demanding economic reforms. Protesters soon began calling for the ouster of President Ali Abdullah Saleh, who had ruled for more than 30 years. The demonstrations swept quickly across the country, and Saleh attempted to crush them by force. A key turning point came on March 18, when security forces killed at least 50 protesters.

After months of unrest, Saleh agreed to hand power to his deputy, Abd Rabbuh Mansour al Hadi, on Nov. 23, 2011. Al Islah – a major Islamist party active in politics since the 1990s – negotiated Saleh’s exit along with the secular General People’s Council. 

Jan. 27: Yemen’s first Arab Spring protest was held in Sanaa. At least 16,000 people participate.

Feb. 2: Saleh announced he will not run for re-election in 2013 or pass power to his son.

Feb. 3: More than 20,000 anti-government protesters gathered for a “day of rage” in Sanaa.

Feb. 10-20: Anti-government protesters demonstrated outside the Egyptian embassy and Sanaa University. At least 25 people were injured in clashes with security forces.

March 18: Security forces cracked down on protesters, killing 57 people and injuring more than 200. Saleh announces a state of emergency.

March 25: More than 100,000 people protested in Sanaa. Up to one million protested in other cities around the country.

April 23-May 6: The Gulf Cooperation Council negotiated an end to the crisis, calling for Saleh to pass power to his deputy in exchange for immunity. Saleh initially agreed, but then refused to step down.

May: AQAP seized Zinjibar in the southern Abyan province.

June 3: Saleh was injured by a rocket attack and sought treatment in Saudi Arabia.

Aug. 13: Houthi rebels and al Islah signed an agreement ending eight months of violent clashes in al Jawf.

October: A wave of massive protests swept across Yemen. More than 800,000 protesters gathered in Sanaa alone.

Nov. 23: Saleh agreed to hand power to his deputy, Abdrabbuh Mansour Hadi.


President Saleh fled the country after a year of massive protests. Elections were held, but Saleh's deputy Abdrabbuh Mansour Hadi was the only candidate. Saleh supporters clashed with security forces following Saleh's departure. 

Jan. 22: Saleh left the country.

Feb. 22: Yemen held elections. Hadi is the only candidate, and he is sworn in five days later.

June: The Yemeni army recaptured the southern cities of Shuqra, Zinjibar, and Jaar from AQAP.

Aug. 1: Saleh supporters stormed the Interior Ministry, prompting clashes with security forces in which 15 people are killed and 43 are wounded.


The National Dialogue Conference began discussing a framework for a new constitution, making progress throughout the year. The United States continued to target AQAP in Yemen with airstrikes, despite the Yemeni Parliament passing a declaration to end U.S. drone strikes. 

March: The National Dialogue Conference began discussions.

July: The United States ramped up drone strikes against AQAP.

Dec. 15: Parliament passed a non-binding declaration demanding the end of U.S. drone strikes on AQAP in Yemen. But Hadi continued to cooperate with U.S. strikes.


The National Dialogue Conference finalized a framework for a new constitution in January 2014, but it did little to end the political crisis. In September, Houthi rebels stormed Sanaa and seized government buildings. The UN brokered a deal requiring Hadi to form a new cabinet in exchange for Houthis ceasing hostilities. But Houthis rejected the new cabinet and continued battling their rivals for control of the capital.

January: The National Dialogue Conference agreed on a framework for a new constitution. But it failed to address the key question of southern independence.

May 7: Yemeni troops seized two al Qaeda strongholds in the south.

May 31-June: More than 500 people were killed in clashes between Shiite rebels and tribesmen backed by the national army.

July: Anti-government tribesmen bombed an oil pipeline, disrupting the flow of oil to a major Red Sea export terminal.

August: Hadi fired his cabinet after two weeks of anti-government protests.

Aug. 9: AQAP killed 15 soldiers in southern Yemen.

Sept. 21-22: Houthi rebels stormed Sanaa and seized government buildings. The UN brokers a deal requiring Hadi to form a new government.

Nov. 1: Houthi rebels attacked the al Islah party headquarters in the southwestern city of Ibb.

Nov. 7-8: Hadi announced a new cabinet, but the Houthis rejected it.

Nov. 28: Houthi rebels and al Islah reached a deal agreeing to cease hostilities, but clashes between the groups continue.

Dec. 14: Houthi rebels blew up a building belonging to al Islah in Sanaa.

Dec. 20: Dozens of protestors gathered in Sanaa to demand that Houthi rebels leave the capital. Houthis responded by abducting activist Shadi Khasrouf, who participated in the protests.


By early 2015, Yemen’s government was still struggling to address demands across its complicated sectarian spectrum. On January 22, Hadi resigned from the presidency under pressure from Houthi rebels. Saudi Arabia, concerned about growing Iranian influence in Yemen, began launching airstrikes against the Houthis in late March.

Jan. 22: Hadi resigned under pressure from Houthi rebels.

March 20: Suicide attacks targeting two Houthi mosques in Sanaa killed more than 130 people and injured more than 300 others.

March 26: Saudi Arabia began launching airstrikes in Yemen, coordinating with a 10-nation coalition.

June 16: Nasser al Wuhayshi, the leader of AQAP was reportedly killed in a U.S. drone strike. Qasim al Raymi was named his successor.

September 22: Hadi returned to Aden after the Houthis are driven out.


As fighting continued between the Houthis and the Saudi-led coalition in Yemen, al Qaeda and ISIS stepped up their attacks. The UN Yemeni Envoy proposed a new peace plan that called for members of the internationally-recognized Hadi government to step down or accept diminished roles in exchange for a Houthi withdrawal from major cities.

Jan. 7: Iran claimed Saudi warplanes attacked Iran’s embassy in Sanaa. The Saudi-led coalition and Yemen’s government denied that the embassy building was targeted.

Jan. 11: A Saudi missile hit a Médecins Sans Frontières (Doctors Without Borders) medical facility in Saada province, killing at least four people and wounding 10.  

Jan. 27: In a leaked report, a U.N. panel called for an investigation of the Saudi-led military operation in Yemen following reports of 119 humanitarian violations by the Saud-led coalition.

Feb. 1: Saudi Arabia launched an inquiry into Yemeni civilian deaths, responding to international criticism.

Feb. 4: A U.S. drone strike killed al Qaeda chief Jalal Baliedy in the southern Abyan province. Baliedy had been suspected of being the new leader of ISIS in Yemen.

Mar. 23: A U.S. airstrike targeting an al Qaeda training camp killed at least 70 fighters and recruits.

Mar. 27: Al Qaeda claimed responsibility for shooting down an Emirati fighter jet with a surface-to-air missile.  

Apr. 21: U.N.-backed talks began in Kuwait between the Houthis and President Abd-Rabou Mansour Hadi’s government. 

May 23: ISIS claimed responsibility for an attack in Aden that killed 40 army recruits amd injured 60 others.

Aug. 7: U.N.-backed talks in Kuwait concluded without an agreement between the Houthis and Hadi’s government.

Aug. 29: ISIS claimed responsibility for a suicide attack on army recruits in Aden that killed 54.

Oct. 8: Saudi-led coalition airplanes hit a funeral in Sanaa, killing 140 people and wounding more than 525 in one of the deadliest attacks in the conflict. The coalition announced it would investigate the airstrike after Washington said it will review support for the alliance.

Oct. 13: A U.S. Navy destroyer launched cruise missile strikes on three radar installations in Houthi-controlled areas overlooking the Bab al Mandab straight. The attack was in retaliation to earlier failed attacks on the navy destroyer USS Mason in the red sea.

Oct. 19-21: War parties agreed to a 72-hour ceasefire, allowing for civilian access to humanitarian aid. The ceasefire helds for 3 days, and Saudi-led coalition airstrikes recommenced shortly after the truce expired.

Oct. 21: A U.S. airstrike reportedly killed five members of al Qaeda in the Arabian Peninsula in Yemen’s Marib governorate.

Oct. 27: U.N. Yemen envoy Ismail Ould Cheikh Ahmed proposed a new peace plan aimed at ending the conflict. It called for members of the internationally-recognized Hadi government to step down or accept diminished roles in exchange for a Houthi withdrawal from major cities.

Oct. 31: U.S. ambassador to the United Nations, Samantha Power, called for an end to indiscriminate Saudi-led coalition airstrikes in Yemen.

Nov. 29: The Houthis and members of the ousted President Ali Abdullah Saleh’s General People’s Congress formed a new 35-minister government based in Sanaa.

Dec. 18: An ISIS suicide attack on a gathering of Yemeni security officers killed 48 and wounded dozens in the southern port of Aden.


The Yemeni crisis intensified late in 2017. Ex-president Saleh was killed by Houthi rebels after publically splitting from them and calling for a "new page" in his alliance with Saudi Arabia. Continued missile attacks by the Houthis on Saudi Arabia heightened tensions between Tehran and Riyadh, culminating with Saudi Arabia charging Iran with an act of war. 

Jan. 18: A Houthi strike killed six civilians in the central city of Taiz, just one day after the killing of six other civilians outside of the city.   

Jan. 21-22: A suspected U.S. drone strike killed three al Qaeda operatives in the south western Bayda province. Separate Saudi-led airstrikes killed at least 52 Houthi fighters in Mokha. Hospital officials in Aden reported the Houthis killed 14 Hadi government attackers.

Jan. 22: Egypt’s National Defense Council extended military participation in the Saudi-led operation for an unspecified amount of time.

Jan. 23: Yemeni government forces seizez control of Red Sea port of Mokha after launching an assault against and pushing out Houthi rebels.

Jan. 28: A U.S. raid on al Qaeda headquarters killed 14 AQAP members in the Arabian Peninsula. One U.S. service member was killed and three others were wounded in the raid.

Jan. 30: Three Houthi suicide boats attacked a Saudi frigate off the Hodeida port in the Red Sea, killing two crew members and wounding three others.

A U.S. drone strike reportedly killed two men traveling in a vehicle in central Yemen who were believed to be al Qaeda militants.

Jan. 31: The Houthis’ official news agency said they launched a ballistic missile at a Saudi-led coalition military base on the Red Sea island of Zuqar on Monday, countering the Saudi claim of a suicide attack. 

Feb. 22:  A senior Yemeni army general was killed in a missile attack by the Houthis.

March 25:  A court in Houthi-controlled territory sentenced President Hadi and six other government officials to death for “high treason.”

May 19:  Yemen’s Houthi movement said it fired a ballistic missile towards Saudi Arabia’s capital Riyadh. The Saudi-led coalition said it intercepted the missile 200 km west of the city.

May 30:  Oman mediated between the Saudi-backed Hadi government and the Houthi rebels over a U.N. plan for peace talks.

June 5:  The Houthis banned U.N. Special Envoy for Yemen Ismail Ould Cheikh Ahmed for abandoning his neutrality and not respecting U.N. resolutions, according to Houthi spokesman Mohammed Abdul-Salam.

June 15:  Houthi rebels fired a missile at a United Arab Emirates ship carrying medical supplies in the Red Sea. One person was injured in the attack.

The U.N. urged warring parties in Yemen to agree to a U.N.-negotiated deal over the management of port city Hodeidah and resuming government salary payments.

June 17:  The Saudi-backed Yemen government agreed to the U.N. two-point solution regarding the Hodeidah port.

July 22:  The Houthis fired a Burkan-2 ballistic missile at an oil refinery in Saudi Arabia.

July 26: Houthi rebels launched a Scud missile, targeting at an oil facility near the port city of Yanbu in Saudi Arabia.

July 29:  The Houthis claimed an attack on a United Arab Emirates ship off the western coast of Yemen. No casualties or damage were reported.

Aug. 23: Houthi fighters called their main ally, ex-president Ali Abdullah Saleh, “evil” and condemned his description of them as a “militia.” The statements highlighted a growing rift between Saleh and the Houthis.

Aug. 24:  Ex-president Ali Abdullah Saleh held a mass rally in Sanaa to celebrate 35 years since the founding of the General People’s Congress (GPC) party.

Aug. 27:  A Yemeni colonel and close adviser to Saleh was killed in clashes with Houthi rebels at a check-point in the southern neighborhood of Hadda.

Aug. 31:  Former president Saleh demanded the arrest of the Houthi gunmen who killed his close adviser.

Early Sept.:  Leaders from Saleh’s GPC party and the Houthis met to fix the rift between both groups.

Sept. 24:  President Hadi said that a military solution is more likely to solve Yemen’s crisis. “The military solution is the more likely one for the Yemen crisis in light of the intransigence of the Houthi and Saleh coup militias which continue to take orders from Iran,” Hadi said in an interview on the sidelines of the U.N. General Assembly.

Sept. 25:  Yemen’s Houthi forces detained a U.S. citizen in Sanaa.

Oct. 1:  The Houthis said they shot down a U.S. surveillance drone in the capital of Sanaa.

Oct. 29:  Saudi Arabian Foreign Minister Adel al Jubeir said Iran is blocking peace efforts in Yemen and is still smuggling weapons to the Houthis.

Nov. 4:  Saudi Arabia said it intercepted a ballistic missile that was fired from Yemen near King Khaled Airport in Riyadh.

Nov. 6:  Saudi Arabia blamed Iran for the Houthi missile attack on Riyadh airport.

Nov. 7:  Saudi Arabian Foreign Minister Adel al Jubeir charged Iran with an act of war following the Houthi missile attack on Riyadh.

The Saudi-led coalition closed all air, land and sea ports to the Arabian Peninsula in order to stem the flow of supplies and arms to the Houthis from Iran.

Nov. 8:  Iranian President Hassan Rouhani said the Houthi missile attack on Saudi Arabia was a reaction to Saudi aggression. “How should the Yemeni people react to bombardment of their country. So they are not allowed to use their own weapons? You stop the bombardment first and see if the Yemenis would not do the same,” Rouhani said.

The White House condemned the Houthi missile attack on Saudi Arabia that occurred on November 4.

Nov. 12:  The Houthis threatened to attack warships and oil tankers in retaliation for Saudi Arabia closing Yemen’s ports.

Nov. 22:  The Saudi-led coalition said it was going to reopen Yemen’s Hodeida port to allow humanitarian aid through to the capital of Sanaa.

Nov. 24:  Remannts of four ballistic missiles fired into Saudi Arabia by the Houthis appear to have been designed and manufactured in Iran, a confidential U.N. report says.

Dec. 2:  Ali Abdullah Saleh publicly split from his alliance with the Houthis. He called for a “new page” in his relationship with the Saudi-led coalition.

Dec. 4:  Ex-president Saleh was killed by the Houthis in a roadside ambush near Sanaa.

Dec. 19: Saudi Arabia intercepted a ballistic missile over southern Riyadh. The Houthis claimed responsibility for the attack, which was targeting the royal Yamama Palace in the capital. No damage was reported. 


Jan. 9: Houthi rebels threatened to block the Red Sea shipping lane if the Saudi-led coalition keeps moving towards the Hodeidah port. “If the aggressors keep pushing toward Hodeidah and if the political solution hits wall, there are some strategic choices that will be taken as a no return point, including blocking the international navigation in the Red Sea,” Houthis’ Ansarullah political council chief, Saleh al-Samad, said. 

Jan. 10: The Saudi-led coalition said it foiled an attack on a Saudi oil tanker by Houthi fighters near the Hodeidah port. The coalition destroyed a boat carrying explosives headed towards the tanker, coalition spokesman Colonel Turki al-Maliki said.

Jan. 11: The Houthis fired a ballistic missile at a special forces camp and a facility for helicopter gunships in the Saudi border province of Najran. Saudi air defence forces shot down the missile mid-air without any casualties, Colonel Turki al-Malki, spokesman for the Saudi-led coalition, said

Jan. 12: A UN panel concluded that Iran violated an arms embargo imposed on Yemen by failing to prevent the Houthi rebels from obtaining Iranian missiles. The report did not say Iran had supplied missiles to the Houthi rebels, but said the Islamic Republic was in "noncompliance" with Resolution 2216, for failing to keep such weapons out of Yemen. 

Jan. 16: Houthi rebels said they fired a short-range ballistic missile toward a regional airport in the Saudi border province of Jizan. Saudi defense forces said they shot down the missile over Jizan. "This hostile action by the Houthi group, which is backed by Iran, proves the Iranian regime's continuous support for the armed Houthi group by providing them with capabilities, which is in violation of UN resolutions," said spokesman for the Saudi-led coalition, Colonel Turki al-Malki. 

Jan. 18: The Houthis fired a missile into the border province of Najran in Saudi Arabia. The missile targeted an air defense operations center and inflicted heavy damage to an air defense base in the Khadhra crossing point in Najran.

Jan. 25: Danny Lavon Burch, a U.S. citizen held captive by Houthi rebels since September 2017, was released and taken to Oman. He was accompanied to Oman by Mohammed Abdel-Salam, a senior Houthi leader. 

Jan. 30: Houthi rebels said they fired a long-range ballistic missile at King Khaled International Airport in Riyadh. This is the second time the Houthis targeted the Saudi airport. 

Feb. 10: Houthi spokesman Mohammad Abdul Salam met with Iranian Foreign Minister Javad Zarif in Tehran. Zarif outlined Iran's four-point peace plan for Yemen and stressed the need for an immediate stop to the war. He also called for the immediate shipment of humanitarian aid to Yemeni civilians. 

The Arab coalition's Patriot air defense systems intercepted a ballistic missile fired by the Houthis from the Ras Kutayb area in the Hodeidah province. The missile was destroyed before reaching its intended target, suspected to be al-Mukha city in the western Yemeni province of Taiz. 

Feb. 12: Major General Gameel al-Mamari, a high-ranking Houthi official, defected to the Yemeni army. Al-Mamari was a spokesman for the Houthis' air defence forces and a deputy director of the military forum, a group of high-ranking army officers in Sanaa. 

Feb. 13: The Houthis agreed to join a new round of peace talks with the General People's Congress party in Oman. The peace talks will take place as soon as a new UN Peace Envoy to Yemen is announced.

Senior Houthi field commander Abu Taha al-Ghalisi was killed in shelling on Houthi positions in the southwestern city of Taiz. Al-Ghalisi was responsible for leading Houthi fronts north of Taiz. 

Feb. 14: The Saudi military repelled a cross border attack by Houthi rebels in the southern border town of Nathran. Around 25 Houthi militants were killed and other wounded. Saudi helicopters also destroyed three Houthi military vehicles. This was the second cross border attack by the Houthis in less than a week. 

Feb. 16-26: The United States, Britain and France drafted a UN Security Council resolution that condemned Iran for failing to stop its ballistic missiles from falling into the hands of the Houthis. The draft also called for renewed UN sanctions on Yemen and would allow the UN Security Council to impose targeted sanctions for "any activity related to the use of ballistic missiles in Yemen." Russia vetoed the resolution. The UN Securty Council subsequently passed a Russian-drafted resolution that renewed the embargo and panel's mandate but left out the Iran-Houthi issue. 

Feb. 21: Mohammed Ali al Houthi submitted a letter to the United Nations to end the three-and-a-half-year war. The document titled "An Initiative to End the Tragedies Caused by the Aggression on Yemen" criticized the U.N. Security Council for failing "to prevent the interference and aggression against Yemen as well as the massacres committed daily against the Yemeni citizens." The letter also included points for ending the conflict, such as forming a reconciliation comittee, presidential and parliamentary elections, international guarantees to begin reconsturction and compensation for damages, and preventing any aggression from foreign countries against Yemen. 

Feb. 27:  The Houthis refused to sign a peace agreement that was built on discussions between the internationally recognized government and themselves, according to outgoing UN envoy to Yemen Ismail Ould Cheikh Ahmed. The Houthis rejected security arrangements that required them to pull out of cities and hand over weapons to a neutral military committee. “It became clear that the Al Houthis were not prepared to make concessions on the proposed security arrangements. This has been a major stumbling block towards reaching a negotiated solution,” Ahmed said in his last briefing to the U.N. Security Council. 

March 1: Coalition airstrikes killed more than 100 Houthi rebels and injured dozens of fighters in the western Hodeidah district. 

March 21: Houthi rebels violenty disbanded a protest by dozens of supporters of ex-president Ali Abdullah Saleh in the Yemeni capital. A number of protestors were detained and some injures were reported. 

March 25: The Houthis fired seven missiles at four Saudi cities - three at the capital Riyadh, one at the southwest city of Khamis Mushait, one at southern Najran and two at Jizan. The Houthi Ministry of Defense claimed the missiles hit seven different targets inside Saudi Arabia, including four airports. But the Saudi coalition denied the claims, saying all missiles were intercepted and destroyed. Fragments from the intercepted missiles killed an Egyptian resident. It is the first death on Saudi soil since the military intervention began. 

March 29: Houthi rebels fired a ballistic missile from the northern Yemeni province of Saada at the Saudi city of Jizan. Saudi air defences intercepted the missile before it could strike its target. 

March 30: The Yemeni army destroyed a Houthi weapons stockpile in Saada province. The strike coincided with a coalition raid on Houthi militias in the northern province. Houthi militants launched a ballistic missile at Saudi Arabia from the province the night before. 

March 31: Saudi air defense forces intercepted a missile fired by the Yemeni Houthis. The missile targeted a Saudi National Guard base in the southern city Najran, a rebel-run news agency reported. An Indian resident was injured by falling debris in the attack. 

April 2: Saleh al Samad, the head of the Houthi Political Council in Sanaa, said the rebels were "ready to buy weapons from any country that wants to sell to us, be it Russia or Iran." But he demanded the weapons be delivered to Sanaa to bypass the coalition blockade. Samad made the comments during a graduation ceremony speech for Houthi military cadets in Sanaa. 

April 3: Houthi rebels struck a Saudi Arabian oil tanker with a missile west of Hodeidah in international waters. A coalition warship intervened and escorted the tanker, which sustained minimal damage, northwards. The Houthis said the attack was in response to a coalition airstrike on the rebel-held Hodeidah port that killed 14 people, including women and children, the day before. 

April 4: Saudi Arabia intercepted a Houthi missile that was intended for southern Jizan. 

April 6: The Houthis fired a missile at the southern city Najran, Saudi Arabia. Saudi defense forces intercepted the missile. No damage or casualties were reported. 

April 11: The Houthis launched a Burkan 2-H ballistic missile at the Saudi capital Riyadh and also targeted oil facilities in southern Najran and Jizan, according to the rebel's Al Masirah television network. The missile traveled more than around 500 miles into Saudi Arabia before it was intercepted by Saudi air defenses. The Saudi-led coalition said it had also shot down two drones in southern Saudi Arabia. The Houthis claimed they targeted some areas with Qasif-1 drones. 

April 12: Saudi air defense forces intercepted a Houthi missile targeting southern Jizan. 

April 13: “As long as the aggression continues, our military capabilities will grow and develop,” said Abdul Malik al-Houthi, the leader of the rebel group. The Houthis also fired a missile at Saudi Arabia for a third day in a row. The missile targeted southern Jizan but was intercepted by Saudi defense systems. 

April 15: Iran supplied the Houthis with drones used to attack Saudi Arabia, the Yemeni government alleged. The drones were "made in Iran" and it was "impossible to manufacture them locally," said Yemen's internationally recongized government. 

April 19: The Houthis shot down a U.S.-drone over Hodeidah, according to Middle East Monitor

Saleh al Sammad, the head of the Houthis' Supreme Political Council, was killed in Saudi airstrikes on Hodeidah province, Al Masirah TV reported. Mahdi al Mashat was elected as Sammad's successor. "This crime will not break the will of our people and state ... [and] will not pass without accountability," Abdul Malik al Houthi said. "The forces of this aggression led by Washington and the Saudi regime are legally responsible for such a crime and all its implications."

April 22: The Houthis fired a ballistic missile at southern Najran. Saudi air defences intercepted the missile, "but the shrapnel scattered over residential areas and cause a fire at a farm belonging to a citizen, without causing any injuries," the Saudi Press Agency said. 

April 23: Saudi Arabia intercepted two ballistic missiles at Saudi Aramco oil production facility in southern Jizan. The Houthis claimed responsibility on its Al Masirah TV. 

April 24: Iranian Foreign Minister Javad Zarif accused the U.S. of fabricating evidence that Houthi missiles launched against Saudi Arabia were manufactured in Iran. 

April 26: Saudi Arabia intercepted four ballistic missiles from Houthi rebels over southwestern Jizan. Falling debris from the interception killed one person. 

April 29: The Houthis vowed to intensify rocket atacks on Saudi Arabia and said they are manufacturing their own ballistic missiles. 

Three Saudi soldiers died in clashes with the Houthis along the Yemen-Saudi Arabia border, the Saudi Press Agency said. 

May 3: The UN's Yemen envoy Martin Griffiths arrived in Omani to meet with Houthi officials to try and revive peace talks. 

May 6: Houthi rebels launched two ballistic missils at the southern city of Najran. Saudi air defence forces intercepted the missiles. Debris from the missiles fell on residential neighborhoods but no injuries or damage were reported. "This hostile action by the Houthi militias proves the continued involvement of the Iranian regime," said Saudi coalition spokesman Col. Turki al Maliki. 

May 9: The Houthis fired missiles at economic targets in Riyadh. Saudi Arabia intercepted one missile and another landed in an uninhabitated area in the desert south of the capital. Col. Turki al Maliki said the Houthis also "failed to launch a short-range Badr-type rocket" toward Najran but it also landed in an desert area. 

May 11: Some 40 Houthis were killed during clashes with Yemeni forces outside the city of Hodeidah. 

May 14: Houhi rebels launched a ballistic missile at Saudi Aramco in southern Jizan province. The missile landed in the open desert and no damage was inflicted, the Saudi-led coalition said. 

May 19: Saudi Arabia intercepted ballistic missiles from the Houthis, which were targeting the city of Khamis Mushait. 

May 22: The U.S. sanctioned five Iranians it said provided Yemen's Houthis with technical expertise and waeponry to launch attacks against Saudi Arabia. 

May 29: Yemeni forces advanced within 20 kilometers of the Houthi-held Hodeidah port. 

Click here to learn more about Yemen's Houthis. 

Cameron Glenn, Hanan Yazid and Mattisan Rowan contributed to this chronology.