FILE -This May 12, 2014, file photo taken from video by Nigeria's Boko Haram terrorist network, shows their leader Abubakar Shekau speaking to the camera. Islamic State militants have accepted a pledge of allegiance by the Nigerian-grown Boko Haram extremist group, a spokesman for the Islamic State movement said Thursday, March 12, 2015. On Saturday, Shekau posted an audio recording online that pledged allegiance to IS. On Thursday, the Islamic State group's media arm Al-Furqan, in an audio recording by spokesman Abu Mohammed al-Adnani, said that Boko Haram's pledge of allegiance has been accepted, claiming the caliphate has now expanded to West Africa. (AP Photo/File) (The Associated Press)
BEIRUT – The spokesman for Islamic State militants said the extremist group has accepted the pledge of allegiance by West Africa's Boko Haram group.