US veteran long-distance swimmer Diana Nyad swam approximately 110 miles from Cuba to Florida in 52 hours, 54 minutes and 18.6 seconds, her support team announced.
They wrote on her Twitter account:
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The world's first ever 'hole in the wall' was installed in Enfield, north London, on June 27 1967.
America says it has "identified preparations" for an attack similar to that which killed at least 86, including 30 children, in April.