Vaccines rushed to Boko Haram area of Nigeria as toddlers paralysed by polio

Nigerian military helicopters have rushed polio vaccines to dangerous parts of the country's north east, where Boko Haram operates and where two toddlers paralysed by the virus were recently discovered, health officials said.

The World Health Organisation said the wild virus has circulated undetected for years in the area where the Islamic extremists have prevented vaccinations.