A Pakistani policeman escorting a polio vaccination team was killed by unidentified gunmen on Quetta's Sarki Road Wednesday, a media report said.
Pakistan is one of only three countries in the world where polio remains endemic, along with Afghanistan and Nigeria. Efforts to eradicate it have been seriously hampered by the deadly targeting of vaccination teams in recent years.
Militant groups often attack polio teams as they see vaccination campaigns as a cover for espionage.
There are also long running rumours about polio drops causing infertility.
