Gunmen kill 3 anti-polio workers in Pakistan

KARACHI, Pakistan: Pakistani police say gunmen have attacked two teams of polio workers in the south, killing three members of the teams and wounding a fourth before fleeing.
Police official Pir Mohammad Shah says two female and a male worker were killed in Tuesday’s attacks in Karachi, the capital of southern Sindh province.
A health official Zafar Ejaz says the vaccination campaign was canceled following the attacks.
No group has claimed responsibility but Pakistani militants have killed several polio workers and police protecting them in Karachi and elsewhere in recent months.
Pakistan is one of only three countries where the polio virus is still endemic.[Source]