A 24-foot powerboat caught fire in the Oak Bluffs harbor just off East Chop Drive early Tuesday, unleashing large plumes of smoke and an array of sirens.

According to Oak Bluffs fire chief John Rose, the fire started in the stern of the boat just before 11 a.m. By the time the fire department arrived on the scene, the entire back of the boat was engulfed in flames.

“When we pulled up the stern of the boat was fully involved,” Mr. Rose said.

As of 11:45 a.m., Chief Rose said the fire had been extinguished and that the department was waiting for the owner to arrive with a trailer to pull the boat of the water. Fire and safety personnel remained on the scene.

“Everything is fine now,” Chief Rose said. “The fire is completely extinguished.”

He said there were no injuries in the blaze. The cause of the fire is unknown. Mr. Rose said the owner was at the site when the fire began.

“The owner was here,” Mr. Rose said. “He was doing some work on the fuel line, and that ignited it. That’s all we know at this point.”

The boat is called Regulator. Chief Rose said he did not know the name of the owner.