"The guys who are laminating the boats are the ones who control the weight, " says Johns.

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SABA, citing sources in Yemen's Coast Guard, said seven other fishermen escaped on a small boat prior to the pirates' taking control of the fishing boats.

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Last year a Tax Court judge ruled for the doc, concluding he had reason to believe he might make a profit, had made money buying and selling other boats and was done in by factors beyond his control.

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From there, the boats sailed four days south to the first town under government control, Mopti.

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They reported seeing the boat "out of control for a short time" and striking some other boats, Jo Rawlings, from the Maritime and Coastguard Agency, told the BBC.

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It recommends introducing an approach similar to air-traffic control to speed up pier use and co-ordinate river boats better with other modes of travel.

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