he National September 11 Memorial and Museum has marked the 10th anniversary of the end of cleanup operations at the site with a tribute to recovery workers and first responders.
Mayor Michael Bloomberg, elected officials and union leaders attended the event Wednesday night at the Sept. 11 memorial plaza at the World Trade Center site.
After the attacks, workers spent months cleaning up the site. The formal end of that operation was May 30, 2002, and was marked with the removal of the last column of steel that had still been standing.
Those at the site worked days and nights to clear away the enormous pile of rubble left behind after the towers fell.
They removed about 1.8 million tons of steel and concrete.