MACOMB TWP. (WWJ) – Two people hurt following a boat explosion at a Harrison Township Harbor.

Authorities are now looking into what caused the incident on Saturday afternoon.

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Tom Havey works at a marina down the street from Roy’s Boat Harbor, where the blast occurred.

Havey said the blast could be felt from over a half a block away … rattling the windows of the marina.

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Havey says one of the men was filling up the tank of his 32-foot boat when the explosion happened.

“More than likely in my experience the fuel lines, the entry lines, to the gas tank are faulty,” said Havey.

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The two men’s injuries are not life-threatening.