A federal grand jury has indicted two men who were arrested after authorities found a bomb in a car at a state prison in Leakesville.

Federal court papers show John Harberson, of Carriere, and Scott Jenkins Waits, of McHenry, were arrested after officers at the South Mississippi Correctional Institution found a pipe bomb in a vehicle June 1.

They were indicted Tuesday on two counts each of making and possessing a destructive device. Waits also was charged with being a user of controlled substances in possession of firearms.

Harberson allegedly told agents he and Waits built pipe bombs before and he forgot one was in the car when Harberson and a woman went to visit an inmate.

Corrections officials say they don’t believe the bomb was intended for the prison.