Gunmen have attacked a UN vehicle, critically injuring a doctor who was administering polio vaccines in the southern Pakistani city of Karachi.
The foreign doctor was in the run-down Sohrab Goth area of the city, officials say. His driver was also hurt.
No group has said it carried out the shooting, but the Taliban have issued threats against the polio drive and are thought to be active in Sohrab Goth.
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