The U.S. says it wasn't involved in the strikes on Iran, but three American officials told NBC News the U.S. is assisting in shooting down Iranian missiles and projectiles targeting Israel.

Sirens sounded in Israel as Iran launched dozens of ballistic missiles in retaliation for Israel's strikes on its nuclear facilities.

Israel’s defense minister has warned that “Tehran will burn” if Iran continues firing missiles. The two countries traded blows on Saturday, a day after Israel launched a blistering surprise attack on Iranian nuclear and military sites,