From AP, where you can read the full story:

The crowd at a Houston music festival suddenly 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 and killing eight people in the chaos.

The pandemonium unfolded Friday evening at Astroworld, a sold-out, two-day event in NRG Park with an estimated 50,000 people in attendance. As a timer clicked down to the start of the performance, the crowd pushed forward.

“As soon as he jumped out on the stage, it was like an energy took over and everything went haywire,” concertgoer Niaara Goods said. “All of a sudden, your ribs are being crushed. You have someone’s arm in your neck. You’re trying to breathe, but you can’t.”

Goods said she was so desperate to get out that she bit a man on the shoulder to get him to move.

The dead ranged in age from 14 to 27, and 13 people were still hospitalized Saturday, Mayor Sylvester Turner said. He called the disaster “a tragedy on many different levels” and said it was too early to draw conclusions about what went wrong.

“It may well be that this tragedy is the result of unpredictable events, of circumstances coming together that couldn’t possibly have been avoided,” said Judge Lina Hidalgo, Harris County’s top elected official. “But until we determine that, I will ask the tough questions.”