A prison inmate pleaded guilty on Tuesday to sending letters to the FBI and secret service that included bomb and anthrax threats - as well as his full name and inmate number.
Donald Ray Bilby, 30, pleaded guilty in US District Court in Trenton to one count of false information and hoaxes after he sent five letters demanding authorities deposit $US20,000 ($NZ32,568) in his county jail inmate account because he needed money for bail, the US Attorney's Office said.
"I think it's fair to say we were not dealing with a great criminal mind here," US Attorney Christopher Christie said in a statement.
Bilby signed all the letters using his full name and inserted his inmate number beneath his signature. One letter to the FBI included demands for money, a piece of paper labelled "anthrax" and a white powdery substance that turned out to be harmless.
He faces a maximum of five years in prison after first serving a sentence for automobile theft.