A body has been found after a swimmer went missing at Camber Sands on Sunday afternoon.
A major search was launched after the 19-year-old man got into difficulty at the East Sussex beach.
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Two other men were airlifted to hospital after they were pulled from the sea. The two men are in a serious but stable condition, according to the BBC.
Emergency services were called just after 12.30pm when the swimmers got into difficulty.
Inspector Mark Evans, of Sussex Police, said: "We are working to establish who these two men are and trace their family and friends."
He added: "It seems this has been three people who have got into trouble while swimming with the changing tides and coastline."
A police spokesperson told ITV News that a post mortem would be carried out to establish the 19-year-old man's death.
John Marlow, 47, from Lancashire, who is on holiday with his family, told the Daily Mail: "My wife and two children were paddling. Two teenagers were swimming behind them and the tide came in fast.
"Then the helicopter lowered a man and picked someone else out of the water, and landed on the beach."
Mr Marlow added: "They were resuscitating him as the tide was still coming in, he was taken away by chopper."
It comes a day after a man died at a beach in Norfolk when a group of swimmers got caught up in a rip tide.
The 54-year-old was pulled from the water unconscious along with another man at Sea Palling.
An RNLI spokesperson said that members of the public pulled them out of the sea.
The 54-year-old man died at the scene while the 26-year-old man was airlifted to the Norfolk and Norwich Hospital and is in a stable condition.