US veteran long-distance swimmer Diana Nyad is just a few miles away from becoming the first person to complete the 103-mile journey from Cuba to Florida without a shark cage.
Ms Nyad's navigator, John Bartlett, said she was at "a distance not ever having been close to achieved by any other human being before."
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The Metropolitan Police Federation, which set up the official JustGiving site, said it felt a "suitable amount" had been collected.