Boko Haram militants have been amassing in the northeast Nigeria town of Gwoza, believed to be the group`s headquarters, killing residents who were unable to flee, a senator and witnesses said Thursday.
Chadian President Idriss Deby on Wednesday vowed to "wipe out" Boko Haram and called on the group`s chief Abubakar Shekau to give himself up, warning that he knew where the militant leader was hiding out.
Nigeria`s Islamist sect Boko Haram released a video purporting to show it beheading two men, its first online posting using advanced graphics and editing techniques reminiscent of footage from Islamic State.
UN Secretary General Ban Ki-moon on Friday slammed "the continuing indiscriminate and horrific attacks" by Boko Haram against civilian populations in Cameroon, Chad, Niger and Nigeria, his spokesperson said.
Soldiers from Chad deployed as part of operations against Boko Haram killed 207 militants in fighting on Tuesday near a Nigerian town close to the border with Cameroon, Chad`s army announced in a statement.