Washington (CNN)ISIS has claimed responsibility for a deadly explosion that killed four Americans — two US service members, a defense contractor and a Department of Defense civilian — in the Syrian city of Manbij on Wednesday, according to the US military.
All four US personnel that were killed were Americans, according to Commander Sean Robertson, a spokesman for the Pentagon.
The civilian was an intelligence expert who was with the troops hoping to collect information about security and adversaries in the area, according to three US officials.
