U.S. allies and adversaries responded to the joint attacks by the U.S. and Israel on Iran with concern over the risks of a new war in the Middle East.

Israel carried out heavy airstrikes on the Hezbollah-controlled southern suburbs of Beirut on Monday, after the Iran-backed group launched missiles and drones towards Israel in retaliation for the killing of Iran's Supreme Leader Ali Khamenei.

Iran vowed revenge on Sunday after the killing of its supreme leader and traded strikes with Israel as part of a widening war prompted by a surprise U.S. and Israeli bombardment.

President Trump said that "heavy and pinpoint bombing" of Iran would "continue, uninterrupted throughout the week or, as long as necessary."

Arizonans, some of them faith leaders, shared their concerns or praise, on what unfolded in Iran on the first day of military engagement.

Former NCAA champion Destiny Littleton documented her harrowing escape to bomb shelters as Iranian missiles and drones struck Jerusalem, where she plays professional basketball.

The State Department cautioned that sudden travel restrictions, rocket alerts, and flight disruptions are possible.

The missile barrages highlight a shortage of bomb shelters in a country that has been preparing for war with Iran for decades.

The United States and Israel have clashed with Iran at an emergency meeting of the U.N. Security Council, where the U.N. chief and many countries urged a halt to their attacks and a return to negotiations.

Operation Epic Fury sparked swift reaction from lawmakers in Pennsylvania, New Jersey and Delaware.