The United States struck three nuclear sites in Iran on Saturday, plunging the U.S. into a pitched battle that has been waged over the past several days between Israel and Iran.

The full ramifications of the U.S. action, announced by President Donald Trump as "very successful" were not clear. Trump and his closest advisers had been weighing for days how to proceed, debating the costs of involvement and inaction.

It was not immediately clear what the U.S. used in the strikes on Fordo, Natanz and Isfahan.

"A full payload of BOMBS was dropped on the primary site, Fordow," Trump posted on Truth Social. "All planes are safely on their way home."

"There is not another military in the World that could have done this. NOW IS THE TIME FOR PEACE!Thank you for your attention to this matter."

Israel and Iran have been exchanging missile barrages since Israel launched a preemptive strike against Iran's nuclear program. Israeli officials said they felt Iran was getting too close to being able to produce a nuclear weapon.

The move, which many feared would draw the U.S. into a widening conflict, came just days after Trump said that he would make a decision about hitting Iran within two weeks.

This is a developing story. Please check back for updates.