FILE - In this file photo of Feb. 27, 1993, a crater is exposed in an underground parking garage of New York's World Trade Center the day after an explosion tore through it. Twenty years ago a group ... more 
FILE - In this file photo of Feb. 27, 1993, a crater is exposed in an underground parking garage of New York's World Trade Center the day after an explosion tore through it. Twenty years ago a group of terrorists blew up explosives under one of the towers, killing six people and ushering in an era of terrorism on American soil.(AP Photo/Richard Drew, File) less 
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Associated Press | Photo By Richard Drew, File
Tue, Feb 26, 2013 8:55 AM EST