A rogue police officer shot a constable dead and critically injured a second policeman before being fatally wounded himself in a gun battle in Hong Kong Friday, according to DPA. The plain-clothes officer pulled out a handgun when he was stopped by two patrolling officers in a subway in the city's Tsim Sha Tsui shopping district at 1 a.m. Friday, police said. In a ferocious exchange of fire, he shot the 33-year-old constable in the head and shot his colleague in the face and leg but was fatally wounded by returning fire from the second officer. Ten shots were fired in the gun battle during which a frantic radio message from the dead constable's colleague brought police reinforcements racing to the bloody scene. Officers found the three men lying in a pool of blood on the subway floor, the constable dead from a bullet to the head, his colleague critically injured and the rogue officer dying from gunshot wounds.