HOUSTON (CBSDFW/AP) – The crowd at a Houston music festival surged toward the stage during a performance by rapper Travis Scott, squeezing fans so tightly together that they could not breathe or move their arms, witnesses said Saturday, hours after at least eight people died in the chaos. The youngest person killed was 14 years old, while the youngest fan injured is 10.

HOUSTON, TEXAS – NOVEMBER 05: Travis Scott performs during 2021 Astroworld Festival at NRG Park on November 05, 2021 in Houston, Texas. (Photo by Erika Goldring/WireImage,)

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The pandemonium unfolded Friday evening at Astroworld, a sold-out, two-day event at the NRG Park stadium. An estimated 50,000 people were in attendance. It was not clear what set the crowd in motion.

Houston Fire Chief Samuel Peña said the crowd “began to compress towards the front of the stage,” which triggered panic and caused some injuries. Then “people began to fall out, become unconscious, and it created additional panic.” Scores of people were hurt.

One ICU nurse and mother who was in the crowd told CBS 11 she thought she was going to die before passing out.

Experts who have studied deaths caused by crowd surges say they are often a result of density – too many people packed into a small space. The pressure can crush victims and render them unable to breathe. The crowd is often running either away from a perceived threat or toward something they want, such as a performer, before hitting a barrier.

One man from Dallas who was working the event said the day after the incident, he was trying to process what he witnessed. “Instead of hearing music… all I hear is helicopters. It’s a freaking crime scene with cops everywhere.”

People in the crowd reported lots of pushing and shoving during the performances leading up to Scott’s set.

When Scott took the stage, the crowd seemed to rush to the front, trying to get closer to the stage, said Nick Johnson, a high school senior from the Houston suburb of Friendswood who was at the concert with friends.

“It just got worse and worse. Everyone was like you just can’t breathe,” said Johnson, who was near the front of the stage in the middle part of the crowd.

Johnson said fans started to crush each other, and people started screaming. He said it felt like 100 degrees in the crowd, which was so thick that he and his friends could not move.

“Everyone was passing out around you, and everyone was trying to help each other. But you just couldn’t move. You couldn’t do anything. You can’t even pick your arms up,” Johnson said.

Scott seemed to be aware that something was going on in the crowd, but he might not have understood the severity of the situation, Johnson said.

On video posted to social media, Scott could be seen stopping the concert at one point and asking for aid for someone in the audience: “Security, somebody help real quick.”

In a tweet posted Saturday, Scott said he was “absolutely devastated by what took place last night.” He pledged to work “together with the Houston community to heal and support the families in need.”

Houston Police Executive Assistant Chief Larry Satterwhite, who was near the front of the crowd, said the surge “happened all at once.”

“Suddenly we had several people down on the ground, experiencing some type of cardiac arrest or some type of medical episode,” Satterwhite said. “And so we immediately started doing CPR and moving people right then.”

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Satterwhite said he quickly met with promoters, who agreed to end the event “in the interest of public safety.”

Amy Harris, a freelance photographer for The Associated Press, described an “aggressive” crowd atmosphere throughout the day because of the way fans were behaving – pushing and rushing the stage barricades and prohibited VIP and admission areas.

“It was definitely the most chaotic festival environment that I’ve been in,” Harris said. “I felt uneasy all day.”

She got trapped behind a barricade while photographing performer Don Toliver because about 300 fans rushed the area. They ended up behind the security barricade with her.

Harris said she encountered a similar scene at a different stage for the main act. She left the media pit after three songs because of the disorder, which resulted in people being pulled over the security barricade to receive medical attention.

At one point, Gerardo Abad-Garcia was pressed so tightly into the crowd that he could not move his arms off his chest. During Toliver’s performance, which came before Scott’s appearance, he started getting concerned for his safety.

“I just couldn’t breathe. I was being compressed,” he said. A security guard helped him and others climb a fence and get out.

He described the crowd during Scott’s set as a wave that was “going forward and backward.”

Some people lost their shoes, and the ground was littered with clothing, water bottles and other trash. He said some people tried to help those who were passed out on the ground, while other concertgoers seemed to ignore them and continued watching the show.

After Scott’s concert, Abad-Garcia saw medical personnel performing CPR on someone who appeared to be unconscious as the person was taken away on a golf cart.

Houston Police Chief Troy Finner urged people not to jump to conclusions about what caused the surge.

“I think it’s very important that none of us speculate. Nobody has all the answers tonight,” Finner said.

Authorities did not disclose the causes of death, and the dead were not immediately identified.

Scott, one of music’s biggest young stars, found the Astroworld Festival in 2018, and it has taken place at the former site of Six Flags AstroWorld each year since, except for 2020 because of the coronavirus pandemic. The 29-year-old Houston native has been nominated for eight Grammy Awards. He has a 3-year-old daughter with Kylie Jenner, who announced in September that she’s pregnant with their second child.

Drake joined Scott on-stage at the concert – which was livestreamed by Apple Music – and posted photos to Instagram after the performance.

Texas Governor Greg Abbott issued a statement after the tragic event as well.

“What happened at Astroworld Festival last night was tragic, and our hearts are with those who lost their lives and those who were injured in the terrifying crowd surge,” said Governor Abbott. “Thank you to the first responders and good Samaritans who were on site and immediately tended to those who were injured in the crowd. The State of Texas is ready assist in the response, and I have directed the Texas Department of Public Safety to make state resources available to support the investigation. I ask Texans to join Cecilia and me in lifting up in prayer those affected by this tragedy.”

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The deaths called to mind a 1979 concert by The Who where 11 people died and about two dozen were injured as thousands of fans tried to get into Cincinnati’s Riverfront Coliseum.