According to DSP Iftikhar Lodhi, the victim was identified as Dr Ishaq, who worked at a private clinic near Al Asif Square.
The officer said that it seemed to be a case of personal enmity before adding that media reports, which described the deceased as a senior member of the World Health Organisation, were yet to be confirmed.
His body was shifted to Abbasi Shaheed Hospital.
Earlier on Tuesday, assailants opened fire at a United Nations vehicle in Sohrab Goth area, wounding a foreign doctor working on a three-day polio vaccination campaign, and a driver, officials said.
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