A reporter stands outside the front door of a house registered to a trading company operated by Navinder Singh Sarao in Hounslow, west of London. on April 22, 2015. Sarao was arrested in connection with the Wall Street flash crash of 2010. Adrian Dennis/AFP/Getty Images hide caption

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Migrants wait to disembark at the Catania harbor in southern Italy on April 24. In recent weeks, hundreds of migrants leaving Libya have drowned trying to cross the Mediterranean Sea to European countries, including Italy, Spain and Greece. Alessandra Tarantino/AP hide caption

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Mohammed Ali Malek is seen at Catania's tribunal, on Friday. Italian prosecutors blamed the captain of a grossly overloaded fishing boat for a collision that capsized and sank his vessel off Libya, drowning hundreds of migrants. Antonio Parrinello/Reuters/Landov hide caption

itoggle caption Antonio Parrinello/Reuters/Landov

Catholicos Karekin II (R, front), the supreme head of the Armenian Apostolic Church, and Russia's President Vladimir Putin walk to attend a commemoration ceremony marking the centenary of the mass killing of Armenians by Ottoman Turks in Yerevan, Armenia. RIA Novosti/Reuters/Landov hide caption

itoggle caption RIA Novosti/Reuters/Landov