The body was found in the River Swale in Richmond late Saturday, North Yorkshire Police said.
Police launched a search for the boy after receiving reports at 5pm on Saturday that a boy had entered the river and not been seen since.
Specialist search teams as well as fire and rescue officers were deployed to help with the search, with crews “recovering a child’s body from the water” at 10.45pm.
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“The body is yet to be identified, but the boy’s family have been informed and are receiving support from specially-trained officers,” police said in a statement.
The death is not being treated as suspicious.
