Fordo, revealed to the public in 2009, is Iran’s second-most-prominent nuclear enrichment facility, whose construction began in the early 2000s. Located near the city of Qom, in central Iran, it has been a source of regular controversy between Iran, Israel, the United States and other countries.

For days, Israel's military has been bombing Iran, its main target:  Iran's nuclear facilities. Israel is convinced that Iran is trying to build a nuclear weapon, an accusation that Iranian leadership has repeatedly rejected.

A likely target is Iran’s uranium enrichment plant at Fordo. Military experts say it is heavily protected and can only be hit by the most powerful bombs.