Nigeria's president Jonathan declares state of emergency

Nigerian President Goodluck Jonathan has declared a state of emergency in three states after a series of deadly attacks by Islamist militant groups.

Militants from Boko Haram have been blamed for most of the violence, which has left 2,000 people dead since 2010.

The Islamist group is fighting to overthrow the government and create an Islamic state in the north.

Will Ross reports from Lagos.