Marina Litvinenko, whose husband died in 2006 after being poisoned, spoke to the media after a British court issued a report saying Alexander Litvinenko had been murdered. Ben Pruchnie/Getty Images hide caption

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This image, supplied by the Metropolitan Police, shows a view of the hole drilled in the vault wall at Hatton Garden Safe Deposit Ltd. following the Easter weekend robbery last year in London. Millions of dollars worth of jewels, cash and other valuable items were taken. Seven men have now pleaded or been found guilty. Handout/Getty Images hide caption

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British police officers stand outside Leytonstone underground train station in east London on Monday. Police are stepping up patrols at transport hubs after Saturday's attack in which three people were stabbed. Matt Dunham/AP hide caption

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Taxis wait in London in June 2014. By law, the drivers of London's black cabs must memorize all of the city's streets, a process that takes years of study. The taxi drivers are opposed to Uber and drivers using a GPS, but the High Court ruled in favor of Uber last week. Oli Scarff/Getty Images hide caption

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A combination photo shows London's Mayor Boris Johnson colliding with 10-year-old Toki Sekiguchi during a game of Street Rugby. Issei Kato /Reuters /Landov hide caption

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John Harris, who runs the T. Cribb & Sons funeral home in the East End of London, stands in the coffin warehouse. The key to staying in business in the changing district is to diversify and specialize, he says. Leila Fadel/NPR hide caption

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Taylor's Vicissitudes, after it began to accumulate coral. Jason deCaires Taylor hide caption

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Military bomb disposal experts examine an unexploded German bomb from World War II in East London. Hundreds of residents were moved out for their safety. Sgt. Ross Tilly/Ministry of Defence hide caption

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Placards are burned at the End Austerity Now rally in Parliament Square, London. Protesters have said the march was the start of a broader campaign to end government cuts to social programs. Daniel Leal-Olivas/PA Photos/Landov hide caption

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Far more than other Western democracies, Britain concentrates its money, power and culture in the capital, London. Elwin van Eede/Flickr hide caption

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Kenya's Eliud Kipchoge (left) celebrates winning the London Marathon next to runner-up and last year's winner Wilson Kipsang, also of Kenya, on Sunday. Facundo Arrozabalaga/EPA/Landov hide caption

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