An Assistant Sub Inspector of Police was martyred and two others injured as armed gunmen opened fire on the police mobile van in Tangi Gandherai area here on Wednesday, local police said. The attackers fled after firing on the vehicle. A search operation is underway in the area, said the District Police Officer (DPO) Irfanullah. The injured policemen, identified as Tauseef and Masur, have been shifted to a nearby hospital while the attackers fled after the incident. The police reached the place of incident and launched a search operation in the area.