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Surveillance footage shows the moment an explosion went off in Syria, on Wednesday, near Manbij’s main market. The ISIL has claimed responsibility for the attack. The victims include two U.S. soldiers, a civilian employee and a military contractor. U.S. forces are in Manbij to back Kurdish and Arab forces. According to Pentagon statistics, Wednesday's blast was the deadliest attack for U.S. anti-ISIL forces in Syria since they were deployed in 2014.