The death toll from an air strike by U.S.-led forces on the northern Syrian province of Aleppo has risen to 52 including seven children, a group monitoring the conflict said on Saturday.
The Syrian Observatory for Human Rights reported that the death toll from Friday’s strike was the highest civilian loss in a single attack by U.S. and Arab forces since they started air raids against hardline Islamist militant groups in Syria such as Islamic State.
U.S.-led forces are also targeting the group in Iraq.
The Britain-based Observatory said the raid had mistakenly struck civilians in a village on the eastern banks of the Euphrates River in Aleppo province, killing members of at least six families.
U.S.-led strikes had killed at least 66 civilians in Syria from the start of the raids on Sept. 23 until Friday’s strike, which brought the total to at least 118. The campaign has also killed nearly 2,000 Islamic State fighters, the Observatory said.
The group said at least 13 people were still missing from Friday’s raid.
The U.S. military did not confirm the civilian deaths but said it takes all such reports seriously and would look into the matter further.
“We currently have no information to corroborate allegations that coalition air strikes resulted in civilian casualties,” Major Curt Kellogg, spokesman for U.S. Central Command, said in an email.
The U.S.-led air strikes have had little impact on the hardline Islamic State group, slowing its advances but failing to weaken it in areas it controls. The group has built its own government in Syria’s city of Raqqa, where it is most powerful.
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