Emirati forces have sexually abused detainees at prisons in Yemen, the Associated Press reported on Wednesday, citing victims and witnesses.
Prisoners held without charges have been sodomised, raped, probed and stripped down in at least five prisons, according to the report.
In one incident at Beir Ahmed prison in Aden in March, hundreds of detainees were sexually abused by searching their anal cavity, AP reported, citing seven witnesses.
"They strip you naked, then tie your hands to a steel pole from the right and the left so you are spread open in front of them. Then the sodomising starts," one prisoner told the news agency.
He added that he did not know what he was being accused of, and that he wishes for death daily without finding it.
Guards had told prisoners that they were searching for cell phones possibly hidden inside the detainees' rectum.
"Its beyond imagination," the victim was quoted as saying.
AP also obtained drawings depicting the abuse smuggled from the prison. "The drawings show a man hanging naked from chains while he is being electrocuted, another inmate on the floor surrounded by snarling dogs as several people kick him, and graphic depictions of anal rape," the AP report reads.
The United States, which is backing the UAE and Saudi-led coalition of Yemen, has denied being aware of the widespread sexual torture. Adrian Rankine-Galloway told AP that Washington has "received no credible allegations" of abuse.
Last year, Human Rights Watch accused UAE forces of arbitrarily arresting or forcibly disappearing Yemenis and moving "detainees outside the country" including to a base in Eritrea.
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"Former detainees and family members have reported abuse or torture inside facilities run by the UAE and UAE-backed forces. Yemeni activists who have criticised these abuses have been threatened, harassed, detained, and disappeared," the rights group said in a report in January.
More than 10,000 people have been killed since Saudi Arabia and the UAE led a bombing campaign against the Houthi rebels. The campaign has also caused a cholera outbreak and brought the already impoverished nation to the verge of famine.
Saudi Arabia views the Houthis as Iranian proxies, but the rebels deny receiving military support from Tehran.
Earlier this month, UAE forces led a military campaign to capture the port city of Hodeidah, disregarding the pleas of aid groups and international officials who warned against the "catastrophic" humanitarian consequences of the assault.