SAN BERNARDINO, Calif. (AP) — Authorities say drug overdoses killed three people who died after attending a Southern California music festival.

San Bernardino County coroner’s officials announced Wednesday that the three accidentally overdosed on the drug Ecstasy.

Twenty-one-year-old Alyssa Dominguez of San Diego and 22-year-olds Derek Lee of San Francisco and Roxanne Ngo of Chino Hills died at hospitals after attending July’s HARD Summer Music Festival in Fontana.

The festival was moved to Fontana from Pomona this year following publicity from the deaths of two concertgoers in 2015. Authorities say those deaths also were due to drug overdoses.

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