Mark Anderson rocked up to the prison with a pizza cutter to free Luigi Mangione, US authorities allege (Picture: Reuters/US District Court)A man allegedly tried to spring Luigi Mangione out of prison in New York by impersonating an FBI agent. Anderson walked up to the intake area at about 6.50pm yesterday and told guards he had papers ‘signed by a judge’ ordering Mangione’s release. Federal prosecutors allege Anderson told guards he had weapons in his backpack – inside the bag was a barbecue fork and a pizza cutter. Rather than flash them an FBI ID card, the man allegedly showed them a driving licence and threw numerous documents at them. Since his arrest five days following the shooting, Mangione has been flooded with supporters – some wearing t-shirts calling for his release.