The cause of death still remains unknown.

Three people died over the weekend after attending HARD Summer Music Festival in Fontana, California, reports Billboard.

Nine people were taken to hospital across the weekend from the festival. A spokesperson from the San Bernardino County Sheriff’s Department confirmed yesterday that two people were pronounced dead on Saturday and one on Sunday. The victims’ names and coroner reports are yet to be released.

A statement from the festival reads: “We were deeply saddened to learn about the deaths of three people who attended the festival this weekend. While the causes of the deaths have not yet been determined, we ask everyone to keep them in their prayers.  Our sincerest thoughts and condolences are with their family and friends.”

The festival featured performances from Major Lazer, Ty Dolla $ign, Anderson .Paak and more.