A Minnesota man was charged Thursday with impersonating an FBI agent after he showed up at a federal prison in New York City claiming to have a court order to release an inmate, identified by a law enforcement source as accused killer Luigi Mangione.Mark Anderson, 35, was arrested at the Metropolitan Detention Center in Brooklyn late Wednesday after prisoner workers asked to see his credentials and he produced a Minnesota driver’s license and “claimed to be in possession of weapons,” according to a complaint filed in the U.S. District Court, Eastern District of New York.Anderson also claimed “that he was an FBI Agent in possession of paperwork ‘signed by a judge’ authorizing the release of a specific inmate,” the complaint states.The inmate is not named in the court document. “Anderson also displayed and threw at (Bureau of Prisons) officers numerous documents,” the complaint states. “They appear to be related to filing claims against the United States Department of Justice.”In his backpack, BOP workers found a barbecue fork and a “round steel blade” that resembled a pizza slice cutter. Anderson had traveled to New York for a job opportunity that didn’t work out, and had been working at an unidentified pizzeria, the law enforcement source said.This is a developing story. Please check back for updates.Ryan J. Reilly is a justice reporter for Jattvibe News.Corky Siemaszko is a senior reporter for Jattvibe News Digital.