Boko Haram sect suspected of carrying out two separate attacks on medical centres in northern city of Kano.
Gunmen on motorbikes have shot dead nine health workers who were administering polio vaccinations in two separate attacks in the northern city of Kano.
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.
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