Thousands of festivalgoers were stranded in the middle of Nevada’s Black Rock desert in the US after a slow-moving rainstorm turned the Burning Man festival into a mud bath, The Guardian reported.

Event organisers have instructed the stranded people to stay in the camps, conserve food and water. They close the gates as festivalgoers are being blocked from leaving the desert.

“Do not travel to Black Rock City!” Burning Man organisers tweeted, referring to the desert area where the alternative festival takes place.

“Access to the city is closed for the remainder of the event, and you will be turned away.”

They said the rain was unlikely to stop until Sunday night. The festival was scheduled to conclude on Monday.

Due to downpours, the “playa,” the huge open-air esplanade where the event unfolds, was rendered impassable.

Last year, the festival contended with an intense heat wave and strong winds, which made the experience difficult for the “burners,” as festivalgoers are known.

Launched in 1986 in San Francisco, Burning Man aims to be an undefinable event, somewhere between a celebration of counterculture and a spiritual retreat.

Initially organised on a San Francisco beach, Burning Man has become a structured festival, with a budget of nearly $45 million (2018 figures) and over 75,000 participants at the last edition, down from the previous one in 2019.

The festival culminates each year with the ceremonial burning of a 40-foot (12-meter) effigy. It has been held since the 1990s in the Black Rock Desert, a protected area in northwest Nevada, which the organisers are committed to preserving.

The local reports described the conditions at the festival as “treacherous” with “thick, slimy mud that clung to shoes and anything else it touched”.