September 11, 2009 (34 images)

U.S. President Barack Obama and First Lady Michelle Obama stand for a moment of silence at 8:46am in honor of those lost during the terrorist attacks on September 11th, 2001, on the South Lawn of the White House in Washington on the eighth anniversary of the attacks, September 11, 2009. UPI/Gary Fabiano/Pool

Mourners of the victims of September 11th, 2001 terrorist attacks pay their respects at the reflecting pool during the 8th Anniversary Commemoration Ceremony in New York at Ground Zero on September 11, 2009. UPI/Peter Foley/Pool

Mourners of the victims of September 11th, 2001 terrorist attacks gather at the reflecting pool during the 8th Anniversary Commemoration Ceremony in New York at Ground Zero on September 11, 2009. UPI/Chip East/Pool

Mourners of the victims of September 11th, 2001 terrorist attacks pay their respects during the 8th Anniversary Commemoration Ceremony in New York at Ground Zero on September 11, 2009. UPI/Joel Cairo/Pool