Arson Squad detectives are investigating a fire that damaged four tree service company trucks and a building early Monday morning in Islip, Suffolk County police said.

The fire at Anderson’s Tree Service, located on the eastbound Sunrise Highway service road between Commack Road and Saxon Avenue, was reported at 4:55 a.m. Fire officials said Islip Fire Department firefighters responded to the scene.

There were no reported injuries.

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But police said four vehicles were set on fire and the adjacent building also was damaged.

Police said the fire is “criminal in nature” and are asking anyone with information to call Crime Stoppers at 800-220-8477. All calls will remain confidential.