A day after a rocket attack on an Iraqi base killed two American troops and a British soldier, U.S. forces said they carried out airstrikes across the country against the Iranian-backed Kataeb Hezbollah militia. Another militia claimed a civilian airport was struck too, but there was no immediate confirmation of that. In a statement, Defense Secretary Mark Esper said his agency would continue taking "any action necessary" against threats to U.S. forces.
What's next? Some say the latest violent tit-for-tat could lead to renewed public protests over the American presence in Iraq.