By Muhammad Irfan Mughal in Dawn, November 15th, 2023DERA ISMAIL KHAN: Unknown militants gunned down a policeman on the Tank-Wana Road in the Wazirabad area of Tank district on Tuesday. According to a police official, constable Sharifuddin was on his way to duty when the militants targeted him near a grid station. He embraced martyrdom on the spot. The assailants fled the scene after the attack. A heavy police contingent, including SP Investigation Haji Nasir…