Muslim police , soldiers accused of killing More than 700 during riots in February 2009 . U.S.-based Human Rights Watch says main victims were young Nigerian men . `` These investigative bodies owe it to the victims and their families to conduct a thorough and impartial investigation into these extremely serious allegations . '' Witnesses say police units summarily executed unarmed men and boys . Human Rights Watch says death toll could be `` substantially higher '' than documented cases suggest .
Muslim police , soldiers accused of killing More than 700 during riots in February 2009 . U.S.-based Human Rights Watch says main victims were young Nigerian men . Witnesses say police units summarily executed unarmed men and boys . Human Rights Watch says death toll could be `` substantially higher '' than documented cases suggest .