At least three policemen were killed in an ambush in Qila Saifullah district on Sunday. Police sources said that unknown armed men riding bikes attacked police check-post near Muslim Bagh area. They opened indiscriminate fire, killing three personnel of police. The assailants managed to escape from the site. The dead were identified as Abdul Wali, Ali Shah and Bahauddin. The law enforcement agencies have cordoned off the area to trace the suspects. Further investigation was underway.