St. Marys, PA – Police in St. Marys have solved the mystery of who caused a loud booming noise last week.

The residents of Trout Run Road had called to report a possible explosion on Jan. 8.

After police investigated, they found that 54-year-old Matthew Glass had thrown an explosive from his car while driving through the area.

He’s being charged with risking a catastrophe, criminal mischief, and disorderly conduct.