The Maine Fire Marshal's office arrested the Old Orchard Beach fire chief early Saturday morning and charged him with setting a fire that burned more than 40 acres three weeks ago.
Ricky Plummer, 59, was arrested at 2 a.m. Saturday and charged with one count of arson.
More than 100 firefighters from southern Maine fought the April 15 fire in the Jones Creek Marsh.
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About a dozen investigators from the fire marshal's office and the forest service, acting on warrants Friday, seized computers at the Old Orchard Beach fire station and seized Plummer's town-owned car and his cell phone.
Plummer was arrested in Scarborough and taken to Cumberland County Jail, where he is being held on $10,000 bail. His arraignment will likely be scheduled next week.