A policeman shot dead by unidentified assailants in Karachi's North Nazimabad neighbourhood on Saturday.

A gunman riding a motorcycle opened fire on the police constable, later identified as Munawwar, near Ziauddin Hospital while he was on the way for duty, police said in a press release.

The body of the 28-year-old constable, who was posted at New Karachi police station, was shifted to Abbasi Shaheed Hospital.

Sindh Inspector General Police AD Khawaja sought a report into the incident from the SSP-West, and directed the police to collect necessary evidence.

The incident comes barely two days after another police officer was gunned down while he was travelling in a private vehicle in Karachi’s Korangi area.

Karachi, a city of around 20 million people and Pakistan's financial capital has been racked in recent years by criminal, ethnic, political and religious violence.

Police and Rangers are currently involved in an operation aimed at cleansing the city of terrorists and other hardcore criminals including hired killers, gun runners and drug peddlers.