Five people in all were injured in the explosion and fire at the business on Trenton Road -- two were taken to a trauma center, one remains in a hospital and two others have since been released.
Kim Peters, Butler County Sheriff's spokeswoman, told our news partner WCPO in Cincinnati a stray spark touched gunpowder at the business about 1:30 p.m. Monday.
Brian Bohnert, spokesman with the Ohio State Fire Marshal's Fire and Explosion Investigation Bureau, said the St. Clair Twp. Fire Department responded to the fire, which had been contained with the help of an installed fire protection system and fire extinguishers used by employees.
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