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Hayatullah Ameri, chief of the Khan Abad district, near where the attack took place, says only one policeman escaped the battle alive. Taliban spokesman Zabihullah Mujahid claimed the attack.
Afghan forces have struggled to combat a resurgent Taliban since US and NATO forces formally concluded their combat mission at the end of 2014, switching to a counter-terrorism and support role.
A wave of attacks this month targeting security forces across the country has killed more than 200 people.