What to know.S. ATTACKS IRAN: The U.S. entered the conflict between Israel and Iran overnight. American warplanes and submarines fired on three nuclear facilities in Iran: Fordo, Natanz, and Isfahan. DETAILS OF STRIKES:

The U.S. is calling the military strikes against Iran Operation Midnight Hammer. According to a defense official, more than 125 U.S. military aircraft participated in the operation. It was the largest B-2 operational strike in U.S. history and the second-largest B-2 mission ever flown, only exceeded by missions after 9/11.U.N. SECURITY COUNCIL:

The council is expected to hold an emergency meeting at 3 p.m. at the appeal of Tehran, U.N. sources tell NBC News.TRUMP TALK: President Donald Trump addressed the nation shortly after the attacks. He said the sites were “completely and totally obliterated.” He added that any future attacks would be “far greater and a lot easier.”NETANYAHU VISITS WESTERN WALL: “The people have risen as a lion,” he said during the visit. “We will continue to achieve wonders and miracles to guarantee the eternity of Israel for generations.” Netanyahu also offered a prayer for the peace of Trump.RISK OF ESCALATION: Iran says it “reserves all options” to respond to the U.S. attacks. United Nations chief António Guterres urged restraint. He recommended de-escalation, saying “at this perilous hour, it is critical to avoid a spiral of chaos.” Trump said any retaliation from Iran on U.S. assets “will be met with even greater force than what was unleashed today.”RETALIATORY STRIKES: Iran launched a missile barrage into Israel this morning. It caused damage and injuries in Tel Avis. Iran’s allies in Yemen, the Houris, said they will join Iran in retaliation.U.S. DEBATE:

Democrats have questioned the legality of the strikes. Senate Minority Leader Chuck Schemer D-N.Y. emphasized that no president should unilaterally march this nation into something as consequential as war. There should not be erratic threats and no strategy.

HUNDREDS KILLED: Since the conflict began 10 days ago, Israeli strikes have killed at least 400 people in Iran. They have also injured 3,000. This is according to Iran’s health ministry. The death toll in Israel from Iran’s retaliatory strikes remains at 24.