Eric Olson is associate director of the Latin America Program at the Wilson Center, a think tank in Washington, D.C.
In March, he witnessed migrants from Central America crossing the Suchiate River illegally from Guatemala into Mexico in full view of Mexican authorities on the border.
But along the border, he saw Mexican authorities boarding buses looking for unauthorized migrants. He said the Mexican government also has recently established a series of checkpoints father inland.
"That's something that they weren't doing before," Olson said.
Olson also toured a government detention facility in Tapachula, a city in the Mexican state of Chiapas north of the Guatemalan border. He said the authorities were "sending people on a daily basis back to Central America."
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