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New London — The city fire marshal is investigating the cause of a suspicious fire on Monday that heavily damaged an unoccupied box truck at The Day’s garage facility at 18 McDonald St.

The fire, which firefighters had extinguished by 8:30 p.m., burned the inside of the cab and spread into the back of the truck. The engine appeared to be undamaged. The truck was one of more than a dozen vehicles in a parking lot situated at the corner of McDonald Street and Jefferson Avenue. No other vehicles were damaged.

A Day employee told Fire Marshal Vernon Skau that he had seen youth inside vehicles in the parking lot in the past.

On Tuesday, Skau said he found evidence inside the burned vehicle that someone had been smoking a blunt — marijuana wrapped in a cigar wrapper.

Skau has not determined whether the fire was accidental or intentionally set. There is additional evidence that blunt smoking occurred in other vehicles in the parking lot.