Prince Harry will visit the US in May on his second official overseas tour.
During his visit, the prince will visit Capitol Hill in Washington, see the areas of New Jersey badly hit by Superstorm Sandy, play polo in Greenwich, Connecticut, and attend a star-studded event in New York.
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Paramedics attended a scene in Willesden, north-west London, on Monday afternoon where they found the teenager with stab wounds.
The popular game relies on Google Maps, a problem in South Korea as those functions are limited by the government.
A Met Office warning covering much of England and south-east Wales is expected to remain in place until 11am.