Sri Lanka, Feb. 28 -- The United States is participating in the Israeli strikes against Iran, according to a U.S. official and a person familiar with the operation, who spoke on condition of anonymity to detail sensitive military operations.

THIS IS A BREAKING NEWS UPDATE. AP's earlier story follows below.

Israel launched a daylight attack Saturday on Iran's capital, with a cloud of smoke rising from the city's downtown. The apparent strike happened near the offices of Supreme Leader Ayatollah Ali Khamenei.

It wasn't immediately clear whether the 86-year-old Khamenei had been in his offices at the time. He hasn't been seen publicly in days as tensions with the United States have grown. But the attack comes as the United States has asse...