On the first day of the Burning Man festival, a woman died mysteriously, just hours after thousands crowded into the desert camp.

She was found unconscious at 11:29 a.m. on Sunday and “immediate life-saving measures were attempted but were unsuccessful,” festival organizers said.

The Pershing County Sheriff’s Office arrived, confirmed the woman’s death, and began an investigation “until the cause and manner of death can be determined.”

A woman died mysteriously on the first day of the Burning Man festival, just hours after thousands crowded into the desert camp

“The participant’s name is being withheld at this time until the next of kin of the deceased can be notified,” said Pershing County Sheriff Jerry Allen.

“Our thoughts and prayers are with the family and friends of the deceased.”

“This is the first reported death on the beach this year and unfortunately it happened on the first day.”

How the woman died and the circumstances of her death are not yet known.

Burning Man organizers said counseling services would be available at the festival for anyone who needed them.

Festivalgoers check in at the Civic Center Plaza on Sunday for buses heading to Burning Man

“The safety and well-being of our employees and our community is our top priority. We are cooperating fully with local authorities as they investigate this incident,” it said.

“The Pershing County Sheriff’s Office investigates all deaths that occur within its jurisdiction.”

“Out of respect for the privacy of the grieving family, we will not release any further details at this time.”

Last year, 32-year-old festival-goer Leon Reece from Truckee, California, died of a suspected drug overdose.