The Taliban killed 13 policemen in an attack on a checkpoint early on Sunday in the northern Kunduz province. <br/><br/>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. <br/><br/>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. <br/><br/>A wave of attacks this month targeting security forces across the country has killed more than 200 people.