Relatives grieve the killing of a young Burundian opposition party activist who was allegedly murdered by police in the Muyira district of Bujumbura Province on Jan. 11, 2016

The United Nations has documented cases of Burundi’s security forces gang-raping women during searches of opposition supporters’ houses and heard witness testimony of mass graves, U.N. human rights chief Zeid Ra’ad Al Hussein said on Friday.

“The 11 December attacks against three military camps and the large-scale human rights violations that occurred in their immediate aftermath appear to have triggered new and extremely disturbing patterns of violations,” Zeid said in a statement.

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