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An Afghan security official, speaking on condition of anonymity because he was not authorised to release the information, confirmed the toll. The Taliban claimed the attack in a media statement.
Afghan forces have struggled to combat a resurgent Taliban since the US and NATO forces formally concluded their combat mission at the end of 2014.
Elsewhere in Afghanistan, a Taliban ambush in the northern Balkh province late Wednesday killed six police, according to Shir Jan Durani, spokesman for the provincial police chief.