Repairs at key missile sites began soon after they were hit by Israeli and U.S. strikes last year, but work at Iran’s nuclear facilities has been slower.

Satellite images show Iran covering and rebuilding parts of Natanz, Isfahan, and Parchin as Washington weighs possible military action. In recent days, multiple satellite photo providers have published pictures of the latest Iranian efforts to conceal the status of the Islamic Republic’s efforts to rebuild its nuclear program at Natanz,

Since the US bombed Iran's key nuclear sites last year, analysts say work has increased at a secret underground facility that could be used to restart Tehran's nuclear program.