© Licensed to London News Pictures. 21/04/2017. London, UK. The King's Troop Royal Horse Artillery ride in to Hyde Park to give a 41 Gun Royal Salute to mark Queen Elizabeth II's 91st birthday. A gun salute is also taking place near Tower Bridge. The Queen's official birthday is celebrated in June with the Trooping the Colour ceremony. Photo credit: Peter Macdiarmid/LN
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