Syrian government forces and allied militias have raped and sexually assaulted women, girls and men in a campaign to punish opposition communities - acts that constitute war crimes and crimes against humanity, UN investigators said on Thursday.
In a gruesome report, they found that opposition groups in Syria's protracted civil war had also committed crimes of sexual violence and torture although these were "considerably less common.”
The report also said Islamic State (IS) and other armed extremist groups have executed women, men and children on charges of adultery, forced girls into marriage and persecuted homosexuals.
"It is utterly repugnant that brutal acts of sexual and gender-based violence continued to be perpetrated throughout seven years by most warring parties," Paulo Pinheiro, chairman of the UN Commission of Inquiry on Syria, told a panel event.
The 29-page report, issued as Syria enters its eighth year of war, is based on 454 interviews with survivors, relatives, eyewitnesses, defectors, lawyers and medical staff.
Karen AbuZayd, an American commissioner on the panel, said the documented cases represented the "tip of the iceberg".
Government forces raped civilians of both sexes during house searches and ground operations in the early stages of the conflict, and later at checkpoints and detention facilities, the report said. The youngest known victim was a nine-year-old girl.
"Rape of women and girls was documented in 20 government political and military intelligence branches, and rape of men and boys was documented in 15 branches," the report by the UN war crimes investigators said.
The independent experts - who have compiled confidential lists of suspects since 2011 - did not name individual perpetrators but said they had documented "numerous" cases of rapes by high-level officers.