Cops attempted to detain the man after an allegation of theft was made against him, at which point he "entered" the water.
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The Metropolitan Police has referred itself to the IOPC following the incident
A body has been pulled from the River Thames after a search for a man who disappeared under the water, police have said.
BBC Local News: London -- The man, believed to be in his early 20s, was found by police divers in south-west London on Sunday.