Some quotes from two news sites and the families. Of course, things are still in motion, and our understanding of the facts may change with time.

Edit: I have found better sources for the claims of rape, though it only states sexual assault, the evidence is grim.

Two videos in particular have raised concerns of sexual assault against women, one of which shows a woman apparently bleeding into her shorts being taken out of a vehicle in Gaza; the woman is alive. The other video shows a woman stripped down to her underwear lying face down in a truck

Even with that small amount of evidence, we can assume that the thirty claimed captives, with the number estimated to be "dozens" by israel will suffer greatly. Sexual assault, and rape, are likely

Social media feeds were flooded with videos of multiple people killed and others being kidnapped as attendees attempted to flee. Relatives of those missing have said they felt abandoned by the government and that they have received little to no help.

“This morning my daughter, Shani Nicole Louk, a German citizen, was kidnapped with a group of tourists in southern Israel by Palestinian Hamas,” said Ricarda. “We were sent a video in which I could clearly see our daughter unconscious in the car with the Palestinians and them driving around the Gaza Strip. I ask you to send us any help or any news. Thank you very much.”

In a separate, unverified video that went viral Saturday, Hamas militants appeared to kidnap a young couple identified as Noa Argamani and Avinatan Or, per CNN. In the clip, Argamani is driven away on the back of a motorcycle as Or walks with his hands behind his back.

Many family members received text messages from loved ones who attended the event before they went missing. Hersh Golberg-Polin, a 23-year-old student, texted his mother and father “I love you, I’m sorry” on Saturday. Born in Berkeley, California, Hersh and his family moved to Jerusalem when he was seven years old. His father, Jonathan Polin, told the Jerusalem Post: “We just want him home and safe. We love you. Come home to us.”

At least 260 bodies have been found at the site of an Israeli music festival following Saturday's attack by Hamas, a rescue organization says

Ricarda Louk — the mother of Shani Louk, a 30-year-old German tattoo artist whose body was seen on video being paraded through the streets in the back of a pick-up truck — asked for help finding her daughter in a video published by German newspaper Bild.

“Nobody has told us anything. Nobody is helping us. It’s chaos,”

“We didn’t even have any place to hide because we were at [an] open space,” Tal Gibly, who survived the attack

Islamic Jihad — a militant Palestinian faction which has also carried out terror attacks in Israel — is holding at least 30 hostages in Gaza who were captured Saturday, according to the group's secretary general, Ziyad al-Nakhala.

Taken from:

https://www.rollingstone.com/politics/politics-news/israel-music-festival-hamas-attack-victims-1234848807/
https://www.cnn.com/middleeast/live-news/israel-hamas-gaza-attack-10-08-23/h_a705b661b6265ed0ddfcd85e9136281a
https://www.timesofisrael.com/footage-of-hamas-assault-on-civilians-shows-likely-war-crimes-experts-say/