Four Americans, including two service members, were among those killed during a blast in Syria, which left at least 19 people dead.
The explosion struck the town of Manbij Wednesday morning, which reports claim is U.S.-patrolled.
The suicide bombing reportedly targeted a restaurant in the city while American officials were on patrol.
There are currently around 2,000 U.S. troops in the war-torn country, and President Trump has made it clear he will bring troops home soon.
Only military equipment has been removed from Syria so far.
ISIS has claimed responsibility for the attack.