PESHAWAR - A policeman was killed and three others injured when a remote control blast targeted police mobile in Landi Sarak area jurisdiction of Khazana Police station Thursday. Police said that the mobile was on routine patrolling when it came under attack.  The blast resulted in the killing of ASI Qayum Dad and injuring three persons identified as Junaid, Atlas Khan and Asim who were shifted to Lady Reading Hospital. Heavy contingent of police rushed the site and cordoned off the area.