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JLX18. New York (United States), 14/05/2014.- (FILE) A file picture dated 14 May 2014 shows a display of an American flag that was raised at Ground Zero during a press preview of the National September 11 Memorial Museum in New York, New York, USA. On 11 September 2001, during a series of coordinated terror attacks using hijacked airplanes, two airplanes were flown into the World Trade Center's twin towers causing the collapse of both towers. A third plane targeted the Pentagon and fourth plane heading towards Washington, DC ultimately crashed into a field. The unprecedented attack claimed the lives of almost 3,000 people. (Atentado, Estados Unidos) EFE/EPA/JUSTIN LANE *** Local Caption *** 51366388

9/11 Memorial Site at Ground Zero

The National September 11th Memorial & Museum