U.N. human rights official cites attacks by Ouattara forces against certain villages . Guillaume Ngefa : The UN says the violence has killed at least 500 people and displaced more than a million in Ivory Coast. Other human rights groups have made recent statements about rising violence .
U.N. human rights official cites attacks by Ouattara forces against certain villages . Guillaume Ngefa : Alleged perpetrators `` must be identified , pursued and punished '' Government skeptical : `` Most of these allegations are supported only by interviews '' Other human rights groups have made recent statements about rising violence .