Meanwhile, the U.S. military has acknowledged a U.S. airstrike last year in Syria likely killed two children, marking the first time the United States has admitted to civilian casualties in the campaign against ISIL. The children were killed in a strike targeting the al-Qaeda-linked Khorasan Group near Harim City. The Syrian Observatory for Human Rights has put the civilian toll from the U.S.-led campaign in Syria far higher, saying 131 civilians have been killed, including 42 children.