Image: 13th anniversary of 9/11 terror attacks
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A woman walks with a child past U.S. flags in Jersey City, N.J., as One World Trade Center is visible across the water. This year marks the 13th anniversary of the September 11th terrorist attacks that killed nearly 3,000 people at the World Trade Center, Pentagon and on Flight 93.

Julio Cortez / AP
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Image: New York Commemorates 13th Anniversary Of September 11th Attacks

Eileen Esquilin hugs her husband, Joe Irizarry, while mourning the loss of her brother, Ruben Esquilin Jr, during the memorial observances held at the site of the World Trade Center.

Andrew Burton / Getty Images North America
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Image: New York Commemorates 13th Anniversary Of September 11th Attacks

An American flag is placed in an inscribed name along the edge of the North Pool during memorial observances held at the site of the World Trade Center on Sept. 11, 2014 in New York City.

Pool / Getty Images North America
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Image: 13th anniversary of 9/11 terror attacks

A woman pauses at the edge of the North Pool during memorial observances at the site of the World Trade Center.

Justin Lane / EPA
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Image: 13th anniversary of 9/11 terror attacks

Sam Pulia, mayor of Westerchester, Ill., and a former police officer of the same town, salutes the name of his cousin, New York firefighter Thomas Anthony Casoria, who was killed in the South Tower of the World Trade Center.

Chang W. Lee/pool / THE NEW YORK TIMES/POOL
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Image: 13th anniversary of 9/11 terror attacks

A woman grieves at her husband's inscribed name at the South Tower Memorial Pool.

Chang W. Lee/pool / THE NEW YORK TIMES/POOL
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Image: Jersey City firefighters attend a ceremony at the 9/11 memorial during the 13th anniversary of the 9/11 attacks on the World Trade Center, in Exchange Place, New Jersey

Firefighters attend a ceremony at the 9/11 memorial in Jersey City, N.J. One World Trade Center is visible in the background.

Eduardo Munoz / X01440
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A boulder marks the crash site of Flight 93 at the Flight 93 National Memorial in Shanksville, Pa., after a service of remembrance.

Gene J. Puskar / AP
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Image: U.S. President Barack Obama pauses during a moment of silence at the Pentagon in remembrance of those who lost their lives in the 9/11 attacks, in Washington

President Obama pauses during a moment of silence at the Pentagon.

Gary Cameron / X00044
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Image: A man places a flower on one of the benches of the Pentagon Memorial in Washington.

A man places a flower on one of the benches of the Pentagon Memorial in Washington.

Pablo Martinez Monsivais / AP
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Image: New York Commemorates 13th Anniversary Of September 11th Attacks

A wilting rose is left in remembrance at the site of the World Trade Center.

Andrew Burton / POOL Getty Images
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A firefighter looks at a memorial mural on the outside of firehouse Engine 10 Company 10 adjacent to the World Trade Center in New York early on Sept. 11. Three hundred forty-three New York firefighters were killed in the terrorist attacks of Sept. 11, 2001.

Mark Lennihan / AP
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Image: BESTPIX - Nation Prepares To Mark 13th Anniversary Of September 11th Attacks

The World Trade Center Tribute in Lights is seen from Liberty State Park on Sept. 10 in Jersey City, N.J.

Tribute in Light Honors Victims of Sept. 11

Kena Betancur / Getty Images North America
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Rick Sarmiento, center, embraces Karen Bingham, left, and Nancy Root, right, during a visit to the Flight 93 National Memorial on Sept. 10, in Shanksville, Pa. Karen Bingham's son Mark Bingham was a passenger on Flight 93, as was Nancy Root's cousin Lorraine G. Bay. The memorial marks the spot where United Airlines Flight 93 crashed 13 years ago in a reclaimed strip mine some 75 miles southeast of Pittsburgh after passengers fought back against hijackers.

Gene J. Puskar / AP
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