PLEASE NOTE: EDIT CONTAINS CONVERTED 4:3 MATERIAL<br/> <br />The aftermath of an attack on health workers in Nigeria's Kano, where nine people were killed in two separate incidents.<br/> <br />Gunmen on motorbikes opened fire on the workers as they administered polio vaccinations.<br/> <br />No one has claimed responsibility - but a group of Islamist militants, who condemn Western medicine, have been blamed for recent attacks.<br/> <br />It's the second time this year polio workers have been targeted, after a similar incident hit Pakistan in January.
