TEL AVIV, Israel, June 22 — President Donald Trump said Saturday that the U.S. military struck three sites in Iran, directly joining Israel ’s effort to decapitate the country’s nuclear program in a risky gambit to weaken a longtime foe amid Tehran’s threat of reprisals that could spark a wider regional conflict.

 There was no immediate acknowledgment from the Iranian government of any strikes being carried out. Iran’s state-run IRNA news agency reported early Sunday that attacks targeted the country’s Fordo, Isfahan and Natanz nuclear sites. The agency did not elaborate.

The decision to directly involve the U.S. in the war comes after more than a week of strikes by Israel on Iran that aimed to systematically eradicate the country’s air defenses and offensive missile capabilities, while damaging its nuclear enrichment facilities. But U.S. and Israeli officials have said that American stealth bombers and the 30,000-pound (13,500-kilogram) bunker buster bomb they alone can carry offered the best chance of destroying heavily fortified sites connected to the Iranian nuclear program buried deep underground.

“We have completed our very successful attack on the three Nuclear sites in Iran, including Fordow, Natanz, and Esfahan,” Trump said in a post on social media. “All planes are now outside of Iran air space. A full payload of BOMBS was dropped on the primary site, Fordow. All planes are safely on their way home.”

Trump added in a later post that he would address the nation at 10 p.m. Eastern time, writing “This is an HISTORIC MOMENT FOR THE UNITED STATES OF AMERICA, ISRAEL, AND THE WORLD. IRAN MUST NOW AGREE TO END THIS WAR. THANK YOU!”

Trump said B-2 stealth bombers were used but did not specify what types of bombs were dropped. The White House and Pentagon did not immediately elaborate on the operation.

The strikes are a perilous decision, as Iran has pledged to retaliate if the U.S. joined the Israeli assault, and for Trump personally. He won the White House on the promise of keeping America out of costly foreign conflicts and scoffed at the value of American interventionism.

Iran’s Supreme Leader Ayatollah Ali Khamenei warned the United States on Wednesday that strikes targeting the Islamic Republic will “result in irreparable damage for them.” And Iranian Foreign Ministry spokesman Esmail Baghaei declared “any American intervention would be a recipe for an all-out war in the region.”

Trump has vowed that he would not allow Iran to obtain a nuclear weapon, and he had initially hoped that the threat of force would bring the country’s leaders to give up its nuclear program peacefully.

The Israeli military said Saturday it was preparing for the possibility of a lengthy war, while Iran’s foreign minister warned before the U.S. attack that American military involvement “would be very, very dangerous for everyone.”

People’s News Monitoring Service