One of the girls kidnapped by Boko Haram from a boarding school in the Nigerian town of Chibok more than two years ago has been found, according to a relative.

A video has surfaced which appears to show some of Nigeria's kidnapped Chibok girls who have not been heard from since the mass abduction by the Islamic extremist group Boko Haram two years ago.

Islamic militants have again attacked the remote Nigerian town from which nearly 300 schoolgirls were kidnapped.

Islamic extremists blew up a bridge, killed an unknown number of people and abducted the wife and two children of a retired police officer in northeast Nigeria, residents said today as an international effort got under way to rescue 276 schoolgirls kidnapped by the militants.