Nigeria's President Goodluck 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 president said the military would take "all necessary action" to "put an end to the impunity of insurgents and terrorists" in Borno, Adamawa, and Yobe states.