President Donald Trump has said the US has struck three of Iran's nuclear sites.
He said the Fordow, Natanz, and Isfahan sites were targeted.
A US official told the Reuters news agency that two B-2 bombers were involved in the strikes.
Earlier this week, Trump said he would make a decision on whether to strike Iran "in the next two weeks" but yesterday, the US moved several of its B-2 bombers to the Pacific island of Guam.
This indicated that the US president may have been prepared to launch a strike sooner than expected.
The B-2 aircraft are capable of delivering the 30,000Ib bunker buster bombs needed to attack Fordow, the Iranian nuclear facility that is buried 300ft inside a mountain.