CLEAR LAKE SHORES, Texas (AP) _ Workers plucked pieces of boats from the water Sunday at a harbor where at least 50 yachts were destroyed in an explosion that set off a chain-reaction fire.

The Saturday night explosion was aboard a pleasure boat moored at the Watergate Yachting Center. The blaze spread to dozens of boats and was brought under control about two hours later.

Watergate Harbor Master Tony Buchanon said bystanders first tried to push the boat away from the pier but the wind brought it back.

Between 50 and 60 crafts were destroyed, said Buchanon and Chief Frank Janoch of the Kemah Fire Department. Buchanon estimated damage at between $2 million and $4 million.

One firefighter was slightly hurt.

On Sunday, workers skimmed oil and gas off the water and picked up pieces of boats. Arson investigators also were looking into the cause of the blaze.

''As far as the cause of the fire, we'll probably never know,'' Janoch said. ''It was such as intense fire, and the one that started it all is on the bottom.''