In Iraq, rockets struck a base housing U.S. troops Saturday, following U.S. airstrikes on Iranian-backed militia groups last week that Iraqi authorities say killed six people. The U.S. said the attacks last week were in retaliation for a rocket attack that killed two U.S. soldiers and a British Army medic two days earlier. President Barham Salih warned such attacks from the U.S. could cause Iraq to descend into a failed state and hand power to the Islamic State.