Investigators say a buildup of gas fumes caused a boat explosion in Virginia Beach that injured three boaters and five marina workers.

Media outlets report that the 20-foot powerboat exploded Monday afternoon at the Lynnhaven Marine Boatel.

Virginia Beach Fire Department officials say three people on board the boat were taken to a local hospital, one with serious injuries and two with minor injuries. A fourth person wasn't injured.

Two marina employees who helped extinguish the burning boat also were taken to a local hospital for smoke inhalation. Three other workers were treated at the scene.

Fire department officials say the boat's power cut off as it was leaving the marina. The explosion occurred when the boaters tried to restart the engine.