Houston Fire Chief Samuel Peña confirmed the casualty figures at a news conference early on Saturday (November 6) outside NRG Park on Friday (November 5) in Houston.
Peña said that at around 9 p.m. the crowd that had gathered for a performance by popular rapper Travis Scott began to push toward the front of the stage, causing panic and injuries.
People began to fall unconscious, and the mayhem escalated until 9:38 p.m. when a "mass casualty incident" was triggered, he said.
The fire department transported 17 people to hospitals, and 11 of those were in cardiac arrest.
It was not yet clear what caused the disaster