State police arrested a 34-year-old Westminster man early Saturday morning and charged him with starting a fire in a delivery truck and damaging a school bus parked at Barnes Towing Service Inc. on Lucabaugh Mill Road, Westminster.
Police charged William M. Lehr of the 200 block of Jocks Drive with arson, malicious destruction of property and theft under $300.
He was released on his own recognizance.
Barnes Towing Service owner Ed Barnes, two of his sons and several friends spotted the fire when they took racing cars back to the shop after dirt track races.
"I'm just glad . . . that we were coming back late," Mr. Barnes said.
Mr. Barnes estimated that the fire had been set only a short time before it was spotted.
If it had burned 15 or 30 minutes longer and reached the gasoline tank, it would have been much worse, he said.
In addition to fire damage to the truck's interior, police reported that the vehicle's windshield, windows and mirrors were destroyed.
They charged Mr. Lehr with theft of a 20-inch steel rod and a breaker bar to a lug wrench set from the truck, valued at $40. The truck is owned by Vincent Rowan of Hampstead.
Police said the bus' mirrors and a window also were damaged. The bus is owned by Lawrence Anderson of Havre de Grace.