As a police party reached in the congested locality and 30-year-old head constable Mohammed Pervez got off the van to check two young men standing there, one of them opened fire on him and fled, said Chakiwara DSP Syed Anwar Ali Shah.
He sustained a single bullet wound in the shoulder, which pierced his heart. He was taken to the Civil Hospital Karachi, where doctors pronounced him dead on arrival.
The officer said that the victim was recently put on intelligence duty in Chakiwara.
The SHO had sent him for identification of the suspects when the incident occurred.