In a statement, His Majesty’s Coastguard said it was responding to a report of two children in difficulty in the water near the Royal Terrace Pier, Gravesend.
One child has been rescued, however, the search is ongoing for a second.
“The alarm was raised at about 1.35pm,” the statement said.
“Metropolitan Police boats are attending as well as the RNLI lifeboat from Gravesend, Kent Police, and a police helicopter.
The South East Coast Ambulance Service was also sent.
It said a “male patient was assessed and treated” at the scene. He was taken to a local hospital for further medical treatment.
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