A police spokeswoman said the boy's death was not being treated as suspicious but it was not clear if he fell into the water or went in deliberately before getting into difficulty.
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Ipswich and Norwich are set to face each other twice in just seven days in what are being billed as the biggest-ever East Anglian derbies.
A full-time carer says the welfare of his disabled child is at "crisis point" because the family's council house is too small.
The winds remain strong over the next 24 hours with further showers at times.