INDIO (CBSLA.com/AP) — Authorities are trying to determine whether drugs or alcohol caused the death of a woman who collapsed last weekend at the Coachella Valley Music and Arts Festival in Southern California.

The Riverside County coroner’s office says 24-year-old Kimchi Truong of Oakland was at the festival in Indio on Saturday when she collapsed. She died at a hospital on Thursday.

READ MORE: Colin Powell, First Black Secretary Of State, Dies At 84 Of Complications From COVID-19

The cause of death wasn’t clear pending an autopsy and toxicology tests, KNX 1070′s Megan Goldsby reported.

“This is a desert. On occasion, we do have heat-related incidences and we work with our fire department and also there has been incidences where they’re alcohol or drug-related,” an Indio
Police Department officer told Goldsby.

READ MORE: Food Truck Crashes In Vernon; One Dead

However, coroner’s Sgt. Curt James tells the Desert Sun of Palm Springs that investigators haven’t ruled out a drug overdose.

Concert promoter Goldenvoice issued a statement saying the festival attendee suffered “an apparent overdose.”

MORE NEWS: `Solidarity' Cited In New Deal For 40k Behind-the-Scenes Film & TV Workers

(TM and © Copyright 2014 CBS Local Media, a division of CBS Radio Inc. and its relevant subsidiaries. CBS RADIO and EYE Logo TM and Copyright 2014 CBS Broadcasting Inc. Used under license. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed. The Associated Press contributed to this report.)