President Obama lays a wreath at the Pentagon Memorial, marking the ninth anniversary of the September 11 attacks on Saturday, Sept. 11, 2010. Charles Dharapak / AP Photo First lady Michelle Obama and former first lady Laura Bush tour the construction site at the Flight 93 memorial with Gordon W. Felt, president of the Families of Flight 93, left, who lost his brother Edward Felt on the flight, and Joanne M. Hanley, superintendent of the Flight 93 National Memorial, in Shanksville, Pa., Saturday. Gene J. Puskar / AP Photo Vice President Joe Biden, joined by his wife Jill Biden, speaks as friends and relatives of the victims of the Sept. 11, 2001 attacks gather for a commemoration ceremony at Zuccotti Park, adjacent to ground zero. /Jason DeCrow / AP Photo (L-R) New York Governor David Paterson, Vice President Biden, Jill Biden, New York City Mayor Michael Bloomberg and New Jersey Governor Chris Christie lay roses in the reflecting pool with family members of victims of the 9/11attacks. Andrew Mills / Getty Images Firefighters from Ladder Co. 10 and Engine Co. 10, located across from the World Trade Center, pause for a moment of silence at 10:28 a.m., marking time the North Tower fell. Henny Ray Abrams / Getty Images A boy sits in silence on the edge of a reflecting pool in memory of victims of the 9/11 terrorist attacks September 11, 2010 in New York City. Chris Hondros / Getty Images Josephine Strenta holds a photograph of her husband's best friend, Joseph Plumitallo, who died on 9/11. Mario Tama / Getty Images An mourner, wearing a button with the picture of Ruben Ornedo of Los Angeles, who was a passenger on American Airlines flight 77 which crashed into the Pentagon, wipes a tear as President Obama attends the Pentagon Memorial. Charles Dharapak / AP Photo Supporters of the proposed Islamic center and mosque to be built near Ground Zero demonstrate in New York on Saturday. David Goldman / AP Photo