Government-allied youth in Burundi have gang-raped women and girls whose male relatives are suspected to be opposition activists, campaign group Human Rights Watch (HRW) has said.
HRW blamed most of the rapes on Imbonerakure, the youth wing of the ruling party, and the security forces.
They have not yet commented on the allegations.
Imbonerakure played a key role in helping President Pierre Nkurunziza remain in power in April 2015.