Partygoers celebrating in Seoul’s Itaewon district, where at least 153 people were killed in the Halloween crowd surge Saturday, were asked to help resuscitate victims of the stampede — some of whom were already dead by the time they got help.

Officials in Seoul, South Korea said Sunday that 26 of the victims were foreign nationals, including at least two Americans. The ages and identities of the victims have not been shared.

One partygoer, a 24-year-old named Ana visiting from Spain, told the BBC she and her friend Melissa, 19, from Germany, had been at a bar next to where the crush took place and were trying to leave as ambulances arrived.

Neither knew how to perform CPR, but quickly began following instructions given by others at the scene.

“They were telling me how to hold their heads and open their mouths, and things like that. I was trying to help but they were both dead as well. I have to say all the people they were bringing in to do CPR, most of them were already not breathing so they couldn’t do anything,” Ana said.

So many people were in need of help that everyone lent a hand, according to Ana, who said it was particularly traumatic because there wasn’t much they could do to help.

“There were so many people that they needed normal people to do CPR. So everyone started jumping in and help. We had two friends who knew how to do CPR and they went out to help,” Ana said.

“Three minutes later or maybe more, they came back, looking so traumatized and crying. Because they tried to save five or six people and they all died in my friends’ hands.”

She added: “We couldn’t do anything, that was the main trauma.”

Sophia Akhiyat, a 31-year-old doctor from Florida, was vacationing in Itaewon when she saw partygoers attempting to carry unconscious people through a crowd.

South Korean police realized she was a doctor and told her to run with them to administer aid, she told The Washington Post.

“These people, I think most of them were near death or dead by the time we were helping them,” she said.

According to Akhiyat, “a pile of humans” blocked the clogged alleyway entrance from the main street, preventing ambulances and emergency response teams from reaching victims.

Her friend, Yoon-sun Park, 24, from Texas, also helped carry victims to clear way for medical professionals.

“It was almost post-apocalyptic. It was almost all civilians, no medical personnel, trying to save these people,” he said.

An estimated 100,000 people, many young adults in their 20s and 30s, attended Halloween celebrations in Itaewon this weekend after two years of COVID restrictions in South Korea were finally lifted.

Videos posted online showed people in costumes being pushed through the narrow streets. Some appeared to climb walls on either side in an attempt to escape the horrifying crush. Other videos and photos taken at the scene show body bags, emergency responders performing CPR and rescuers pulling unconscious people out of the crowd.

The streets were so densely packed with people and slow moving vehicles that it was practically impossible for emergency response teams and ambulances to get there swiftly.

As of Sunday evening, the official death toll was 153, with at least 133 suffering from injuries. The dead included at least 26 foreign nationals, including people from Iran, Norway, China, Thailand and Uzbekistan.

At least two Americans were killed in the stampede. The death count could rise as 37 of those injured were in serious condition.

Ninety-seven of the dead were women and 56 were men. Over 80% of the dead were in their 20s and 30s, and at least four were teenagers.

South Korean president Yoon Suk-Yeol has declared a national mourning period as authorities investigate what caused the deadly crush.