A Sub Inspector of Police has been killed and another policeman injured in firing by unknown armed men on a police mobile in Islamabad Sector I-10/2. According to the details, the ill-fated police mobile was on a routine patrol when attacked by two motorcycle riders leaving policeman severely injured. Sub Inspector Riaz succumbed to injuries on way to hospital while Constable Mohammad Ashraf sustained severe injuries, he has been admitted to a hospital and his condition is said to be critical. According to eye witnesses the armed men escaped quickly after the crime. The law enforcement agencies have cordoned off the whole area and have started a search for the culprits while all the exit and entry points of Islamabad are being monitored.