The UN atomic watchdog issued a report Friday, February 24 which showed Iran enriching uranium to a level closer to weapon-grade at a new site, in clear defiance of an international drive to get Iran to rein in its nuclear ambitions.

The enrichment up to 20 percent is taking place not just at Iran's main plant, in Natanz, but at a new plant at Fordow, which is built under a mountain. Israel has expressed concerns this site could be impregnable against a bombing attack from the air and thus put Iran in a so-called zone of immunity against military action.