The fire chief says the dock lines securing that boat burned off, and the burning vessel then drifted and caused another boat and two docks to catch fire.

A day at the docks turned dangerous on Saturday as a boat exploded at the Miss Croix Yacht Harbor fuel dock in Prescott, Wisconsin."We were sitting on the back of the boat and heard a loud bang," Steve Schiller,

Officials say the 17-foot Chris-Craft boat exploded after the ignition switch was turned on, injuring the Waterford father (45), his son (16) and their friend (16). The friend was transported to an area hospital with burns over 50 percent of his body. He was last listed in critical condition.