Local officials are investigating a fire that destroyed three school buses in the Pleasant Street storage yard in Attleboro late Saturday night and considering it “suspicious,” according to a fire department official.

Attleboro fire officials were alerted by police at 10:57 p.m., said deputy chief Ed Grieve.

“It’s an unsecured lot, which means anybody had access to the buses by just walking into the lot,” he said.

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Grieve said the buses hadn’t been used since Friday and were not plugged into electrical power outlets, which is common for parked diesel engine vehicles.

“So there’s really nothing that suggests it’s a mechanical issue,” he said.

Authorities have no video footage of the lot and no witnesses.

“We are treating it as suspicious at this time,” said Grieve.

He said officials will notify the state fire marshal’s office but intend to keep the investigation within the department.

No further information was available.