Hospitals workers say at least 19 people were killed all but one of them women when a car bomb exploded on the outskirts of a northern Syrian city.

The car detonated next to another vehicle carrying mostly female agricultural workers on the outskirts of the city of Manbij, in Syria's northern Aleppo province.

A car bomb exploded on Monday in Manbij, Syria, killing 19 and injuring 15. The attack, the seventh in over a month, threatens Syria's post-war security. Factions have clashed, with accusations flying.