NEW YORK, NY - SEPTEMBER 11: Daniel Henry, a Port Authority of New York/New Jersey police officer, pauses during a moment of silence at 9:01 am EDT, at the South reflecting pool of the 9/11 Memorial during ceremonies for the twelfth anniversary of the terrorist attacks on lower Manhattan at the World Trade Center site on September 11, 2013 in New York City. The nation is commemorating the anniversary of the 2001 attacks which resulted in the deaths of nearly 3,000 people after two hijacked planes crashed into the World Trade Center, one into the Pentagon in Arlington, Virginia and one crash landed in Shanksville, Pennsylvania. Following the attacks in New York, the former location of the Twin Towers has been turned into the National September 11 Memorial & Museum. (Photo by Stan Honda-Pool/Getty Images)
On the twelfth anniversary of the Sept. 11, 2001 attacks, people observe a moment of silence for the fallen victims at the World Trade Center memorial, the White House and the Pentagon.