Marking the 12th anniversary of 9/11

Carrie Bergonia of Pennsylvania looks over the name of her late fiancé, firefighter Joseph Ogren, at the 9/11 Memorial in New York during ceremonies marking the 12th anniversary of the attacks.

The family and friends of the passengers and crew of Flight 93 gather around a bolder that marks the plane's impact area during a memorial service at the Flight 93 National Memorial in Shanksville, Pa., on Sept. 11, 2013.

Secretary of the Interior Sally Jewell, left, and Gordon Felt, center, whose brother Edward P. Felt was a passenger on Flight 93, place a wreath with the help of Navy honor guard Matthew Konchan, of Johnstown, Pa., in front of the wall containing the names of the 40 crew and passengers on Flight 93 at the Flight 93 National Memorial in Shanksville, Pa., on Sept. 11, 2013.

Mercedes Arias listens as they read the name of her father Joseph Amatuccio at the 9/11 Memorial in New York during ceremonies for the twelfth anniversary of the terrorist attacks.

Friends and family members gather at the 9/11 Memorial during ceremonies marking the 12th anniversary of the attacks.

A note partially covers a name of a victim at the North Pool at the 9/11 Memorial in New York during a ceremony marking the 12th anniversary of the attacks.

A woman pauses along the edge of the north reflecting pool at the 9/11 Memorial in New York during a ceremony marking the 12th anniversary of the attacks.

President Barack Obama participates in a wreath-laying ceremony at the Pentagon in Arlington, Va., in remembrance of the 12th anniversary of the Sept. 11 attacks.

Flowers and pictures are left along the North Pool at the 9/11 Memorial in New York.

A woman prays at the edge of the North Pool at the 9/11 Memorial in New York during a ceremony marking the 12th anniversary of the attacks.

Jose Rosales observes a moment of silence honoring the victims of the Sept. 11 attacks outside the World Trade Center site in New York on Sept. 11, 2013. Bagpipes, bells and a reading of the names of the nearly 3,000 people killed when hijacked jetliners crashed into the World Trade Center, the Pentagon and a Pennsylvania field marked the 12th anniversary of the attacks.

A U.S. sailor sits in the Pentagon 9/11 Memorial before remembrance ceremonies in Washington on Sept. 11, 2013.

Gail Silke and her niece Erica Tierney trace the name of Gail's brother Steven Bristoll, who worked as a police officer, at the 9/11 Memorial during ceremonies marking the 12th anniversary of the attacks.

Daniel Henry, a Port Authority of New York/New Jersey police officer, pauses during a moment of silence at 9:01 am EDT at the South reflecting pool at the 9/11 Memorial during ceremonies marking the 12th anniversary of the attacks on the World Trade Center.

A family member of a victim of the Sept. 11 attack on the Pentagon sits in the memorial site before an observance ceremony at the Pentagon on Sept. 11, 2013, in Arlington, Va. Family members of victims and survivors of the attack gathered to hear from President Barack Obama and other leaders at the National 9/11 Pentagon Memorial near the place where terrorists drove a jetliner into the Department of Defense headquarters in 2001.

President Barack Obama, first lady Michelle Obama, Vice President Joe Biden and Jill Biden join members of the White House staff during a moment of silence to mark the 12th anniversary of the 9/11 attacks on Sept. 11, 2013, on the South Lawn of the White House.

Relatives and friends attend the 9/11 Memorial ceremony marking the 12th Anniversary of the attacks on the World Trade Center in New York.

A photo of New York City Firefighter James Crawford, who died on 9/11, is placed by his relatives on the 9/11 Memorial during ceremonies on Sept. 11 marking the 12th anniversary of the attacks.

A man walks through the 9/11 Empty Sky memorial at sunrise across from lower Manhattan and One World Trade Center in Liberty State Park in Jersey City, N.J., on Sept. 11, 2013.

FDNY Firefighter Mike Bellantoni prepares a memento at the Firefighter's Memorial adjacent to the World Trade Center Sept. 11, 2013, before the start of the official ceremonies at the 9/11 Memorial nearby.

The Tribute in Light is illuminated next to the Statue of Liberty and One World Trade Center during events marking the 12th anniversary of the 9/11 attacks on the World Trade Center in New York on Sept. 10.

The Tribute in Light rises above buildings in lower Manhattan during a test on Sept. 10 in New York. The light display commemorates the twin towers of the World Trade Center that were destroyed in terrorist attacks on Sept. 11, 2001.

Visitors to the Flight 93 National Memorial participate in a sunset ceremony with a giant flag memorializing Flight 93 on Sept. 10, 2013, in Shanksville, Penn. Workers broke ground on the Flight 93 National Memorial on Sept. 10, beginning construction on the 6,800-square-foot visitor center that will tell the story of Flight 93. Four hijackers turned the plane toward Washington, D.C., likely targeting the U.S. Capitol building, before passengers and crew stormed the cockpit and tried to regain control. The plane crashed into a field and everyone on board was killed.

A visitor kisses an name on the wall containing the 40 names of the crew and passengers of Flight 93 at the Flight 93 National Memorial during a candlelight remembrance on Sept. 10 in Shanksville, Penn.

A couple looks out at New York's Lower Manhattan and One World Trade Center from Liberty State Park in Jersey City, N.J., on Sept. 9.