America Marks 15th Anniversary of 9/11 Terror Attacks
Memorial services were held on Sunday to mark the 15th anniversary of the 9/11 terror attacks.
Firefighters perform the changing of the guard at the FDNY Memorial Wall near the World Trade Center on Sept. 11, 2016.
A man holds a sign as he attends the ceremony for the victims of the terrorist attacks at the National September 11 Memorial and Museum.
A man places a paper into the 9/11 memorial names during the anniversary memorial service in New York.
Firefighters arrive for a memorial service at the World Trade Center complex.
Ann McGuire pays her respects at the Steel Beam Memorial in Jacksonville, North Carolina.
A firefighter stands as part of an honor guard at the FDNY Memorial Wall.
New York Yankees pitcher Dellin Betances, left, and manager Joe Girardi carry a wreath to the September 11th memorial in Monument Park at Yankee Stadium.
President Barack Obama sits onstage before delivering remarks at an observance ceremony at the Pentagon.
Firefighters hold out a flag during the commemoration ceremony at the National September 11 Memorial and Museum.
A flag stands amid names on the 9/11 memorial before the start of the anniversary memorial service to 9/11 victims in New York.
A girl holds her mother during a commemoration ceremony for the victims at the National September 11 Memorial and Museum.
People attend a commemoration ceremony at the National September 11 Memorial and Museum.
A man ties a memorial ribbon to the exterior wall of St. Paul's Chapel In Manhattan, New York.
Police officers stand outside Ground Zero.
FULL COVERAGE: Remembering 9/11