Suspected members of the Boko Haram sect have been blamed for torching police stations and carrying out fatal sniper attacks on police officers and local officials in the remote northeast of Africa's most populous country.
Around 700 migrants from Niger, Cameroon and Chad have been expelled amid fears the sect may be drawing members from outside Nigeria, said Babayo Alkali, the top immigration official in Maiduguri, capital of the northeastern state of Borno.
