US rapper Travis Scott is facing multiple lawsuits after at least eight people were killed and hundreds injured in a crush at his festival Astroworld.
The lawsuits include allegations that Scott and surprise performer Drake incited the crowd, and that concert producer Live Nation failed to provide adequate safety measures.
The rappers and Live Nation have not responded directly to the suits.
Scott has said he is working to help the families of the victims.
The youngest of those killed at the Texas festival was just 14 years old.
The surge began at about 21:15 local time on Friday (02:15 GMT Saturday), when panic broke out as the crowd pressed towards the front of the stage during Scott’s headline set.
Lucas Naccarati told BBC Radio 5 Live that within three minutes of the rapper coming on stage, he “was pretty sure people [were] going to be dying”.
“You couldn’t move, you couldn’t scratch your own face, [that’s how] tight it was,” he said.
In a statement posted to Twitter, Houston police chief Troy Finner said he met with Scott and his head of security “for a few moments” prior to the event to express his concerns about safety.
As part of their investigation, police in the Texas city are looking into separate reports that somebody in the audience was injecting people with drugs.
Several concertgoers had to be revived with anti-drug overdose medicine, including a security officer who police said appeared to have an injection mark in his neck.
FBI Director Christopher Wray has said that the bureau is providing “technical assistance” to investigators