Three people died over the weekend after attending the Hard Summer Music Festival in Fontana, California.
The festival took place outdoors at the Auto Club Speedway as temperatures reached the upper 90s. Authorities told the Fontana Herald News that heat may have played a role in the deaths.
Festival organizers had encouraged attendees to hydrate and seek medical attention if they needed it — even if they were under the influence.
Last year, two young women died at Hard Summer after drug overdoses.
At the time, one LA supervisor said event organizers should take responsibility by providing a safe, drug-free environment.
"If raves are only going to exist when drugs and alcohol are available, then they are no longer welcome in Los Angeles County’s facilities,” Michael Antonovich told the Los Angeles Times.
Ultimately, the county decided not to fully ban raves, though it allowed officials to consider each on a case-by-case basis.
For 2016, Hard Summer moved from its previous local at the LA County Fairplex to the Auto Club Speedway in San Bernardino County.