The mystery surrounding a man found dead in a pool of blood at Burning Man deepened after police asked attendants to help identify the victim.

The unidentified body of a male was discovered at around 9.15pm on Saturday, during the festival's climax, as the wooden 'Man' effigy began to burn in the northwestern Nevada desert, police said.

Detectives are looking into the death as a homicide, as festivalgoers continue gathering in the makeshift encampment called Black Rock City.

Police have now asked the 70,000 festival attendants for help in the probe, the San Francisco Chronicle reported.

The victim is believed to be a white male between the ages of 35 and 40, approximately 6 feet tall and 200 pounds, with short brown hair and facial hair, according to Pershing County Sheriff Jerry Allen.