This evidence, from the press release I linked below:

Following allegations of brutal sexual violence committed during and in the aftermath of the Hamas-led terror attacks, Pramila Patten, the Special Representative of the Secretary-General on Sexual Violence in Conflict, led an official visit to Israel from 29 January to 14 February to gather, analyse and verify reports of sexual violence related to the 7 October attack. Due to ongoing hostilities, the Special Representative did not request to visit Gaza, where other UN entities that monitor sexual violence are operational.

“What I witnessed in Israel were scenes of unspeakable violence perpetrated with shocking brutality,” Ms. Patten recalled. Detailing her methodology, she said that her team met with families of hostages and members of communities displaced from several kibbutzim. It conducted confidential interviews with 34 individuals, including survivors and witnesses of the 7 October attacks, released hostages, first responders and health and service providers. It visited four attack sites — as well as the morgue to which the bodies of victims were transferred — and reviewed over 5,000 photographic images and some 50 hours of footage of the attacks.

“It was a catalogue of the most extreme and inhumane forms of killing, torture and other horrors,” including sexual violence, she stated. The team also found convincing information that sexual violence was committed against hostages, and has reasonable grounds to believe that such violence may still be ongoing against those in captivity. While there are reasonable grounds to believe that conflict-related sexual violence occurred in the Nova music festival site, Route 232, and kibbutz Re’im, reported incidents of rape could not be verified in other locations. Concurrently, the team determined that at least two allegations of sexual violence in kibbutz Be’eri — widely reported in the media — were unfounded.