At least two investigations are now underway into the deadly stampede which took placed at the opening night of the Astroworld music festival in Houston, Texas.
As yet, eight people have been killed and hundreds injured after a huge crowd surge.
A sold-out headline show by rapper and festival organiser Travis Scott on turned deadly when guests began pushing towards the front of the stage, crushing some and reportedly leaving them unable to breathe.
Officials said a 14-year-old was among the victims, and that a security guard may have been injected with drugs as the chaos unfolded.
The mayor of Houston has vowed to “leave [no] stone unturned” in investigating the disaster, while Mr Scott said in a message to fans that he is “absolutely devastated.”
Livestreamed footage of the event showed the rapper pausing his performance as an ambulance arrived at the venue, NRG Park.
