LONDON, UNITED KINGDOM - JULY 7:  Prince William, Duke of Cambridge lays a wreath during the July 7 memorial in Hyde Park to commemorate the tenth anniversary of the London 7/7 bombings on July 7, 2015 in London, England.  Today is the tenth anniversary of the 7/7 bombings, when four suicide bombers struck transport system in central London on Thursday 7 July 2005, killing 52 people and injuring more than 770 in simultaneous attacks.  (Photo by Anthony Devlin - WPA Pool/Getty Images)