OMAHA, Neb. (AP) — A man who pleaded guilty in June to manufacturing explosive materials in a shed behind his Ralston house has been sentenced to six months in prison.

51-year-old Jeffrey Belmont was sentenced Friday in U.S. District Court.

Authorities raided Belmont’s home last June and seized a stash of improvised devices and more than 2,000 pounds of chemicals used to make flash powder — a powerful, illegal explosive.

In 2005, one of Belmont’s rocket fireworks injured a 13-year-old boy, and authorities confiscated more than 2,000 pounds of commercial-grade fireworks from Belmont’s home.