A U.S.-led coalition in Syria killed more than 100 troops allied with Syrian President Bashar al-Assad on Wednesday.

The coalition launched air and artillery strikes in response to an unprovoked attack on rebel fighter headquarters in Khusham, Syria.

U.S. troops were embedded with the Syrian Democratic Forces when approximately 500 pro-regime troops attacked with tanks, mortar fire, and artillery.

SDF forces liberated the area from Daesh, or ISIS, in Sept. 2017.

The pro-regime forces were likely seeking to seize oilfields in Khusham that had been a major source of revenue for Daesh from 2014 to 2017, according to an official who spoke to Reuters.

The coalition responded with targeted air and artillery strikes, killing an estimated 100 pro-regime forces, the official said.

While one SDF fighter was injured, no American troops were killed or wounded in the incident, the official said.

With News Wire Services