Unidentified armed men gunned down a police constable on Jinnah Road here on Thursday, police said. The Balochistan Liberation Army (BLA) has accepted responsibility for the killing. The gunmen fired on a policy contingent deployed in the area. Constable Juma Khan succumbed to his injures before getting treatment at QuettaÂ’s Civil Hospital. The police cordoned off the area and started a search operation.