FILE -- In this March 28, 2018 file photo, a Syrian fighter from the Kurdish police force, guards the entrance of the Manbij Military Council, the Kurdish-led, US-backed, militia group that defends Manbij, Syria. Early Tuesday, March 26, 2019, gunmen attacked a checkpoint at one the entrances of Manbij, killing seven fighters, an official with the council said. The Britain-based Syrian Observatory for Human Rights, a war monitor, said sleepers cells of the Islamic State group carried out the attack. (AP Photo/Hussein Malla, File)
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