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 yea

 

              FILE -  In this file photo of Feb. 27, 1993, a crater is exposed in an underground parking garage of New York
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)