Burning Man attendees are trapped in the Nevada desert after a rainstorm turned the ground to mud.
Organizers warned attendees to conserve food and water, and take shelter.
The feds said the mud required "a full stop" of vehicle movement, and shuttered the entry point.
Tens of thousands of attendees at Burning Man have been told to shelter in place and conserve food and water, after a rainstorm prompted intensely muddy conditions, halting movement in and out of the temporary metropolis known as Black Rock City.
"Stay prepared for adverse weather conditions continuing through the night and into Saturday," the organizers warned.
Burning Man Traffic, a social media account issuing updates about the conditions on the ground, posted Saturday afternoon that those in Black Rock City should "conserve food, water, and fuel, and shelter in a warm, safe space."
The account added that no vehicles beyond emergency vehicles were permitted to drive.
The Bureau of Land Management told USA Today on Saturday that any attendees trying to enter Burning Man would be turned away for the remainder of the event, advising any inbound participants to "turn around and head home."
"Rain over the last 24 hours has created a situation that required a full stop of vehicle movement on the playa. More rain is expected over the next few days and conditions are not expected to improve enough to allow vehicles to enter the playa," the statement said.
The Bureau of Land Management did not immediately respond to Insider's request for comment.
Burning Man, which bills itself as a "participative temporary metropolis," occurs each year in a dried lakebed in the Nevada Desert. The event lasts nine days, involves art installations and musical performances, and draws a number of celebrities, tech execs, and billionaires each year. The event also revolves around the burning of a 40-foot human effigy.
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