Damascus, Syria — Another car bomb exploded on the outskirts of a city in northern Syria on Monday, killing at least 19 people and leaving over a dozen wounded, hospital workers and emergency responders said.

Eighteen women and one man were killed, a nurse at the local hospital, Mohammad Ahmad, told The Associated Press. Another 15 women were wounded, some in critical condition, according to the local civil defense.

No group immediately claimed responsibility for the blast that occurred next to a vehicle carrying agricultural workers on the outskirts of Manbij.

It was the seventh car bombing in Manbij in over a month, said Munir Mustafa, the deputy director of civil defense, warning that the attacks near Syria’s second city are a threat to Syria’s efforts to bring about post-war security and economic recovery.

Manbij in northeastern Aleppo province continues to see violence two months after the fall of President Bashar Assad in an insurgent offensive.

– The Associated Press