Nigerian police , soldiers accused of killing 133 during riots in November 2008 . Comment: Witnesses say police units summarily executed unarmed men and boys . There is a history of religious violence in central Nigeria , where majority-Muslim north Africa meets largely Christian sub-Saharan Africa . HRW says death toll could be `` substantially higher '' than documented cases suggest .
Nigerian police , soldiers accused of killing 133 during riots in November 2008 . Comment: Witnesses say police units summarily executed unarmed men and boys . HRW says death toll could be `` substantially higher '' than documented cases suggest .