Police say a 16-year-old boy's family are aware of the discovery and are being supported.
Anyone who may have witnessed what happened has been asked to contact police.
Mandy Dowsett, the co-owner of Methley Bridge Chandlery, said there had been a huge emergency response and she had offered her services with the rescue effort."We asked if there was anything we could do with our boats, but because we have the propellers they said not as it was too dangerous."
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