At the ground zero site in lower Manhattan, family members and others read the names of the 2,753 people killed there in the September 11th attacks 11 years ago.

Eleven years after the horrific terrorist attacks, Americans paused Tuesday to remember with words and tears. Moments of silence mark the times when planes crashed into the Twin Towers, then the hit on the Pentagon and the crash at Shanksville, Pa.

Eleven years after the horrific terrorist attacks, Americans paused Tuesday to remember the fallen with the reading of 2,753 names and moments of silence to mark the times when planes crashed into the Twin Towers, the Pentagon and in Shanksville, Pa.

Eleven years after the horrific terrorist attacks, Americans paused Tuesday to remember the fallen with the reading of 2,753 names and moments of silence to mark the times when planes crashed into the Twin Towers, the Pentagon and in Shanksville, Pa.

ISAF Commander GEN John Allen and his top senior enlisted advisor, Command SGM Thomas Capel salute the commemorative wreath in honor of all those who paid the ultimate sacrifice in Afghanistan.

ISAF Commander GEN John Allen and his top senior enlisted advisor, Command SGM Thomas Capel salute the commemorative wreath in honor of all those who paid the ultimate sacrifice in Afghanistan.

President Barack Obama and First Lady Michelle listen to Taps being played on the White House lawn on the 11th anniversary of the September 11th attacks.

At the ground zero site in lower Manhattan, family members and others read the names of the 2,753 people killed there in the September 11th attacks 11 years ago.

At the ground zero site in lower Manhattan, family members and others read the names of the 2,753 people killed there in the September 11th attacks 11 years ago.

New York City's 'Tribute In Light' to the victims of the 9/11 attacks shines from One World Trade into the sky over Manhattan Sept. 10, 2012 in New York City. The lights were tested a day before the 11th anniversary of the attacks of Sept. 11, 2001.