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FILE - In this file photo of Feb. 26, 1993, firefighters in a cherry picker remove an explosion victim on a gurney outside one of the World Trade Center's twin towers in New York, after an explosion rocked the complex. Twenty years ago a group of terrorists blew up explosives in an underground parking garage under one of the towers, killing six people and ushering in an era of terrorism on American soil. (AP Photo/Alex Brandon, File)