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Friends and families of victims of the Sept. 11, 2001, terror attacks, look over a reflecting pool during a ceremony at the National September 11 Memorial, Tuesday, Sept. 11, 2012 in New York. As in past years, thousands are expected to gather at the World Trade Center site in New York, the Pentagon and Shanksville, Pennsylvania, to read the names of nearly 3,000 victims killed in the worst terror attack in U.S. history. (AP Photo/Mark Lennihan)

Friends and families of victims of the Sept. 11, 2001, terror attacks, look over a reflecting pool during a ceremony at the National September 11 Memorial, Tuesday, Sept. 11, 2012 in New York. As in past years, thousands are expected to gather at the World Trade Center site in New York, the Pentagon and Shanksville, Pennsylvania, to read the names of nearly 3,000 victims killed in the worst terror attack in U.S. history. (AP Photo/Mark Lennihan)

Remembering 9/11

Americans across the country paused Tuesday to mark the 11th anniversary of the Sept. 11, 2001 terror attacks.