Newly-released documents show that FBI spied on the Burning Man festival in 2010. It remains unclear if FBI agents actually attended the event. Burning Man [takes place] in an isolated Nevada desert, where up to 70,000 people gather annually for music, art, drugs and large fires. The revelations of federal surveillance come from heavily-redacted internal FBI memos handed to ... reporter Inkoo Kang, who filed a request under the federal Freedom of Information Act for any FBI documents "mentioning the phrase 'Burning Man." In late August, a private security firm contacted the FBI's Las Vegas division for help conducting a "threat assessment" ahead of the event, to which the FBI replied that they had no worrying intelligence about Burning Man. Days later, the Las Vegas division messaged the FBI's Special Events Management Unit requesting guidance on planning an approach to the festival. A subsequent paragraph, sandwiched between two entirely-redacted paragraphs, said, "scheduled overtime for special agents assigned to work special events will be approved under certain very limited and relatively rare circumstances," raising question over whether or not FBI special agents were deployed at Burning Man. A final memo listed two "accomplishments" from the operation; one was redacted, the other was "local agency liaison established/utilized." The FBI concluded that the greatest threat present at Burning Man was "use of illegal drugs by the participants."