The attacks were carried out with rockets and one-way drones. U.S. Department of Defense spokesman Air Force Brig. Gen. Pat Ryder explained that, between October 17 and 24, American troops in Iraq were attacked 10 times.

During the same time frame, U.S. troops in Syria were attacked three times.

At a Monday briefing, a senior defense official said that they expected to see a “significant escalation” of attacks against American troops due to the war.

“I think it’s fair to say when you see this uptick in activity in attacks by many of these groups, there’s Iranian fingerprints all over it,” the defense official explained.