An 18-year-old O'Fallon Township High School student was charged Thursday with unlawful possession of a destructive device.
Thomas Lee Stanton, 18, of Lebanon, was arrested Wednesday after local, state and federal authorities searched his home on Troy-Scott Road north of O'Fallon and found bomb-making equipment.
A federal indictment issued by a grand jury in U.S. District Court in East St. Louis alleges that Stanton possessed one or more explosive devices, including a "cricket" bomb made from carbon-dioxide cartridges, fuses and explosive powder.
If convicted, Stanton faces a possible maximum penalty of 10 years in prison, a $250,000 fine and three years of supervised release.
Stanton was arrested Wednesday afternoon at school after bomb-making materials were discovered at his Lebanon home, according to John Betten, the O'Fallon police chief.
Betten, in statements to the media, had said four other individuals were being detained by the police department in connection with the case.
The high school was placed on lockdown early Wednesday afternoon after the explosives were discovered at Stanton's house.