A mourner holds a picture of a loved one at the 9/11 Memorial.
Port Authority Police Department recruit Tom McLaughlin observes a moment of silience at the South Pool of the 9/11 Memorial.
Members of Congress observe a moment of silence during a September 11th remembrance ceremony on the steps of the U.S. Capitol.
United States Secretary of the Interior Sally Jewell (C) wipes away a tear at the Flight 93 National Memorial during ceremonies commemorating the 12th anniversary of the 9/11 attacks.
Dennis Palmer, of Bayshore, NY, pays his respects to family and friends at the South Pool of the 9/11 Memorial.
Carrie Bergonia of Pennsylvania looks over the name of her fiance, firefighter Joseph Ogren at the 9/11 Memorial.
Flowers stand in a name at the at the 9/11 Memorial.
A view of a note left on a name at the North Pool at the 9/11 Memorial
United States Secretary of the Interior Sally Jewell (2R) walks with the family of pilot Leroy Homer at the Flight 93 National Memorial.
President Barack Obama listens to military taps after laying a wreath during a ceremony in observance of the terrorist attacks of 9/11 at the Pentagon.
A flower lies atop names of victims at the 9/11 Memorial
A moment of silence is observed at 8:45 a.m.on the South Lawn of the White House.
New York City's Tribute In Light shines near One World Trade Center in Manhattan.