U.S. troops in eastern Syria came under rocket attack Monday, with no reported casualties, one day after U.S. Air Force planes carried out airstrikes near the Iraq-Syria border against what the Pentagon said were facilities used by Iran-backed militia groups to support drone strikes inside Iraq, writes AP.

Iraq’s military condemned the U.S. airstrikes, and the militia groups called for revenge against the United States.

Pentagon Press Secretary John Kirby said the militias were using the facilities to launch unmanned aerial vehicle attacks against U.S. troops in Iraq. It was the second time the administration has taken military action in the region since Biden took over earlier this year.