karachi - An assistant sub-inspector was killed when unknown gunmen opened fire in Manghopir area of Karachi Thursday, media reports said. According to police, some unidentified attackers opened fire on a motorcyclist who died on the spot. Later, the victim was identified as Shahjahan Yousuf, 45. He was posted as an ASI in Maghopir police station. Witnesses told that the attackers were on foot and fled easily after shooting.