The war over Iran engulfed more of the Middle East and beyond on Monday as strikes intensified, Iran-backed groups stepped up attacks and a fourth U.S. service member was killed in action.

Iran and Iranian-backed militias fired missiles at Israel and Arab states, apparently hitting the U.S. Embassy compound in Kuwait, while Israel and the United States pounded targets in Iran on Monday.

The U.S. and Iran have a long history of tensions, including a CIA-led campaign to topple Iran's prime minister in 1953 and the taking of American hostages in 1979.

U.S. and Israel continue attacks against Iran, three American service members killed and Trump says more deaths are "likely," Iran targets Gulf states and U.S. bases as retaliation.

Hundreds of thousands of travelers have been stranded by the outbreak of war with Iran.

Millions of Israelis have sought safety in shelters after Iran launched retaliatory attacks on Israeli cities following the death of Iran's supreme leader.

Four U.S. service members have been killed in ongoing Middle East operations as U.S. and Israeli strikes pound Iran and Tehran answers with successive waves of missiles and drones across the region.

People in Iran describe what it's like inside the country after the killing of the country's supreme leader and amid continued airstrikes from the U.S. and Israel.

What are the Trump administration's apparent goals in Iran and how likely is it that military force will achieve them? NPR's Leila Fadel talks to the Quincy Institute's Trita Parsi.

Iran's retaliation following U.S. and Israeli strikes has seen missiles and drones hammer Gulf states and U.S. bases across the region, turning once-quiet skies over cities like Dubai, Doha and Manama into battle zones.