About 50,000 people were at the sold-out outdoor music festival at NRG Park — the stadium complex where the Astrodome and the NRG Stadium stand — when the incident happened just after 9 p.m.
Twenty-three people were taken to hospitals — 11 of whom were in critical condition — and eight of them died, Peña said.
The event, now in its third year, is organized by Scott, a Houston native.