Two policemen were killed while two others wounded in a bomb attack in western Afghanistan's Farah province, authorities said Monday. "On Sunday evening, a vehicle of the Afghan Public Protection Police Force set off an improvised explosive device, causing two police cops killed and two others wounded," a provincial police source told Xinhua. He blamed the Taliban insurgent group for the attack which took place in Dilaram district of the province. The Taliban has largely been using home-made IEDs to launch suicide attacks and roadside bombings against security forces.