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.
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.
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.
A woman pauses at the edge of the North Pool during memorial observances at the site of the World Trade Center.
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.
A woman grieves at her husband's inscribed name at the South Tower Memorial Pool.
Firefighters attend a ceremony at the 9/11 memorial in Jersey City, N.J. One World Trade Center is visible in the background.
A boulder marks the crash site of Flight 93 at the Flight 93 National Memorial in Shanksville, Pa., after a service of remembrance.
President Obama pauses during a moment of silence at the Pentagon.
A man places a flower on one of the benches of the Pentagon Memorial in Washington.
A wilting rose is left in remembrance at the site of the World Trade Center.
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.
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
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.