Nigeria kidnap: The scale of the problem on the ground

The governor of Nigeria's Borno state says he has information on the whereabouts of about 200 schoolgirls kidnapped by Islamist group Boko Haram.

More countries have pledged their support, with France offering to hold a summit on Islamist militant group Boko Haram.

BBC World Affairs Editor John Simpson says that help will be needed, as he witnesses the scale of the problem finding the girls, on the ground in Borno state.