Keywords: May 28 2002 Ground Zero Cleanup 07.jpg New York City May 28 2002 -- Aid workers sign the last piece of debris to be removed from Ground Zero The event marked the final removal of the last remaining World Trade Center structure Column Number 1001B of Two World Trade Center The 30-foot column remained standing following the collapse of the twin towers when terrorists flew two commercial airliners into both skyscrapers Sept 11 2001 The resulting collapse created a mountain of 1 8 million tons of steel and concrete More than 3 000 people perished in the attack U S Navy photo by Photographer ™s Mate 2nd Class Bob Houlihan http //www news navy mil/view_single asp id 1657 PD-USGov-Military-Navy Ground Zero World Trade Center in 2002 May 2002 photographs 28 May May 2002 |