Nigeria Goes To The Polls Amid Boko Haram Security Threat

Nigerians head to the polls today to vote for their next president. They will choose between the incumbent Goodluck Jonathan and former military ruler Muhammadu Buhari. But there are concerns of a repeat of 2011's post-election violence, when around 800 people died. Our Special Correspondent Alex Crawford is in Kano in the north of the country where the threat from the militant group Boko Haram has put security at the heart of the election.