Bond for accused arsonist Charles Wayne Collier was set at $250,000 for each of the four arson charges against him during his first court appearance Thursday.
Collier, 25, was on probation for a previous arson conviction when he allegedly set the fires in downtown Hattiesburg, authorities say.
Collier remains in the Forrest County jail. If convicted, he could face up to 20 years in prison for each charge.
Investigators say evidence and tips through Crimestoppers helped them solve the case.
Collier is accused of torching two vans, and a week later a school bus, at Mount Carmel Ministries, and an unoccupied building on North Main Street.
Collier is not a suspect in the arson fire at the Old Hattiesburg High School building last month. Investigators say they're still looking for the person who committed that crime.