Farah provincial spokesman Abdul Rahman Zhawandai said today that the Afghan National Police squad was on patrol along the region's main highway when they were ambushed in a mountain pass.
Zhawandai said the attack occurred late yesterday as about 40 policemen were patrolling the highway in several vehicles.
Insurgents frequently ambush vehicles and tricks on the highway, which is a main trade route through the province.
The Taliban have escalated attacks in recent months as they try to take advantage of the withdrawal of foreign troops, who handed over security for the country to Afghan forces two months ago.