Gunmen attacked a police checkpoint in northwest Pakistan at dawn on Friday, killing four policemen before speeding away in a getaway vehicle, police said. The attackers sprayed bullets at policemen sheltering from rain inside a check post building in Ghazi Kot town in the mountainous Mansehra district. Four policemen were killed on the spot. They were taking shelter inside the check post when rain started. One injured is still unconscious, Zulfiqar Jadoon, a police official told AFP by telephone from the scene. This is a clear act of terrorism, Jadoon said. The gunmen arrived in a vehicle and fled after the attack, he said. An intelligence official confirmed the incident and blamed miscreants, a term widely used by Pakistani officials in reference to Taliban and other militant networks.