No one claimed responsibility but the Islamist militant group Boko Haram, which has condemned the use of western medicine, has been blamed for a spate of assaults on security forces in the city in recent weeks.
The shootings will hamper efforts by global health organisations to clear Nigeria of polio, a virus that can cause irreversible paralysis within hours of infection.
http://oodds.blogspot.com/2013/02/nine-polio-health-workers-shot-dead-by.html
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