A U.S. military strike on Friday targeting fighters with the Islamic State has killed 52 civilians, including 7 children and 9 women, the Syrian Observatory for Human Rights reported on Saturday.
According to the human rights watchdog group, an additional 13 Syrian civilians are missing following the attack on a village in the northern province of Aleppo. The deaths mark the highest civilian loss from a single attack since the U.S.-led coalition began its war against the Islamic State, or ISIS, in September 2014.
"[We] condemn in the strongest terms this massacre committed by the U.S led coalition under the pretext of targeting the IS in the village, and we call the coalition countries to refer who committed this massacre to the courts, as we renew our calls to neutralize all civilians areas from military operations by all parties," the group said in a statement.
Coalition airstrikes have killed an estimated 118 civilians. However, Reuters notes, the U.S.-led attack has "had little impact on the hardline Islamic State group, slowing its advances but failing to weaken it in areas it controls."
"Washington and its allies say their aim is to support what they call moderate rebels fighting against both Syrian President Bashar al-Assad and Isis," Reuters continues. "But four years into Syria’s civil war, no side is close to victory. A third of the population has been made homeless and more than 220,000 people have been killed."