Photo Gallery Mourning at Ground Zero
Karen Castel comforts Yachiyo Kuge of Osaka, who mourns her son's death. Toshiya was a passenger on flight 93, which crashed in Pennsylvania.
Members of the color guard hold an American flag at Ground Zero in New York City.
People who lost a loved one created an impromptu shrine on a telephone pole close to the site where the twin towers used to stand.
New York City Mayor Michael Bloomberg speaks to citizens and guests at the ceremony.
A member of the New York Fire Department rings a ceremonial bell after a moment of silence.
People walk down a ramp to the footprints of the former World Trade Center.
Mourners leave flowers and prayers in a pool at the base of the World Trade Center on Ground Zero.
Looking for comfort: Two people embrace as families gather to mourn and remember.
