Barely a week ago, the militant group released a video where they threatened the emir of kano and the lives of civilians if the military don't back-off.
The group just released a video apparently showing civilians shot dead as they lie face down in what looked like a school hall.
"We had made sure the floor of this hall is turned red with blood and this is how it is going to be in all future attacks and arrest of infidels", said the group leader, Shekau.
The militants claimed those men killed in the video are infidels.

source: http://www.breakingnews234.com/2014/12/boko-haram-release-video-showing-them.html

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