12 năm sau ngày 9/11

Mija Quigley of Princeton Junction, New Jersey, embraces the name of her son Patrick Quigley who died on 9/11

President Barack Obama, first lady Michelle Obama, Vice President Joe Biden, and Jill Biden stand for a moment of silence on the South Lawn at the White House in Washington, as they mark the 12th anniversary of the September 11 terror attacks

Carrie Bergonia looks over the name of her fiance, firefighter Joseph Ogren, during ceremonies at the 9/11 Memorial marking the 12th anniversary of the 9/11 attacks

First responders gather in lower Manhattan at the World Trade Center site as the nation commemorates the anniversary of the 2001 attacks which resulted in the deaths of nearly 3,000 people after two hijacked planes crashed into the World Trade Center, one into the Pentagon in Arlington, Virginia and one crash landed in Shanksville, Pennsylvania

The World Trade Center Flag is presented as friends and relatives of the victims of the 9/11 terrorist attacks gather at the National September 11 Memorial at the World Trade Center site on Wednesday morning

Former Mayor Rudy Giuliani, left, and current New York Mayor Michael Bloomberg, right, at the 9/11 Memorial ceremony to mark the 12th Anniversary of the attacks on the World Trade Center in New York

Kayla Fallon, daughter of William Fallon who died on 9/11, wipes away tears at the 9/11 Memorial during ceremonies marking the 12th anniversary

New Jersey Governor Chris Christie, left, and New York Governor Andrew Cuomo, right, pictured at the ceremony at the 9/11 Memorial

President Barack Obama and first lady Michelle Obama put their hands on their hearts during the playing of 'Taps' as they stand on the South Lawn of the White House in Washington

Family members of New York City firefighter Christopher A. Santora from Engine 54, Ladder 4, Battalion 9, who died in the 9/11 attacks on the World Trade Center, observe a moment of silence during a ceremony near the firehouse on West 48th street

Flowers and pictures are displayed by a name along the north reflecting pool at the 9/11 Memorial

Retired FDNY Marshal Ernie Medaglia, of Bronxville, N.Y., who was at the attacks at the World Trade Center on Sept. 11, 2001, is emotional as he listens to New York Gov. Andrew Cuomo at a ceremony near the 9/11 Memorial honoring first responders and FDNY Rescue 1 on the 12th anniversary of the attacks

A woman wipers her eyes after reading the name of her brother, Bobby Hughes, at the National September 11 Memorial, left, and a pair of people embrace, right,  as friends and relatives of the victims of the 9/11 terrorist attacks

A TSA color guard takes part in a ceremony at Cleveland Hopkins Airport Wednesday, Sept. 11, 2013, marking the 12th anniversary

President Barack Obama, accompanied by Defense Secretary Chuck Hagel, wipes his face as he speaks during a 9/11 remembrance ceremony at the Pentagon on Wednesday morning

President Barack Obama lays a wreath at the Pentagon during a ceremony marking the 12th anniversary of the worst terror attack on the U.S.

US President Barack Obama, left-rear, and others salute during the playing of the US National Anthem during a memorial service at the National 9/11 Pentagon Memorial

Senate Majority Leader from Nevada Harry Reid, center, speaks during a 9/11 remembrance ceremony in Washington, DC

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

A woman reflects at the 9/11 Memorial during ceremonies marking the 12th anniversary of the 9/11 attacks on the World Trade Center

Friends and relatives of the victims of the 9/11 terrorist attacks gather at the National September 11 Memorial at the World Trade Center site

Relatives of the victims of gather, left, at the National September 11 Memorial at the World Trade Center site, while Daniel Henry, right, a Port Authority of New York/New Jersey police officer observes a moment of silence at 9:01 am EDT

Hannah Townsend, 25, gives a prayer next to the One World Trade tower at Ground Zero on September 11, 2013 in New York City

Singer Billy Joel, left, and motorcycle designer and television personality Paul Teutul, Jr., look up at One World Trade Center Wednesday, Sept. 11, 2013, after they rode with firefighters and first responders with the FDNY Motorcycle Club from FDNY Rescue 1 headquarters to the World Trade Center site

Gail Silke, left, and her niece Erica Tierney trace the name of Gail's brother Steven Bristoll who died while working as a police officer on September 11, 2001

Relatives rub the names listed on the edge of a reflecting pool at the 9/11 Memorial during ceremonies marking the 12th anniversary of the attacks on the World Trade Center

The names of those who died when the hijacked jets crashed into the World Trade Center and the Pentagon were read out at the ceremony at the two-year-old memorial plaza

Family members of Ji Yao Justin Zhao pay their respect to him at the South Poll of the 9/11 Memorial during ceremony marking the 12th anniversary of the 9/11 attacks

The World Trade Center Flag is presented as friends and relatives of the victims of the 9/11 terrorist attacks gather at the National September 11 Memorial

UNITED IN REMEMBRANCE: THE DIFFERENT EVENTS MARKING THIS YEAR'S  9/11 ANNIVERSARY

NEW YORK CITY
In a sadly familiar ceremony, friends and relatives of World Trade Center attack victims gathered at the National Sept. 11 Memorial plaza to call out the names of the dead and read messages to their lost loved ones.

A bell tolled to mark the moments when four hijacked jets crashed into the twin towers, the Pentagon and a field in the Pennsylvania countryside, and again to mark the moments when the two skyscrapers collapsed.

Several politicians attended, including New Jersey Gov. Chris Christie and former New York Gov. George Pataki, but none gave an address.

WASHINGTON
President Barack Obama held a moment of silence at 8:46 a.m. on the White House's South Lawn to mark the first attack in New York. He was joined by Michelle Obama, Vice President Joe Biden and his wife Jill Biden. A bugler played 'Taps.'

At the Pentagon Sept. 11 memorial in Arlington, Va., victims' families, attack survivors and military officials laid a wreath and held a moment of silence at 9:37 a.m. to mark the moment that Flight 77 hit the building.

PENNSYLVANIA
More than 200 people gathered at the Flight 93 National Memorial to read the names of 40 passengers and crew killed when the airliner crashed into a field near the small town of Shanksville.

Recalling the passengers and crew who had fought the hijackers, U.S. Interior Secretary Sally Jewell told the assembled families and spectators, 'We never know when we'll be called to lay down our lives for others.'

Jose Rosales observes a moment of silence honoring the victims of the September 11 attacks outside the World Trade Center site, where bagpipes, bells and a reading of the names of the nearly 3,000 people killed took place to mark the 12th anniversary of the Sept. 11 attacks in 2001

TSA agents sing 'God Bless America' at a checkpoint in Cleveland Hopkins International Airport on Wednesday, Sept. 11, 2013, during a ceremony marking the 12th anniversary of the 2001 terrorist attacks

A woman gazes at the One World Trade Center as church bells toll for 9/11 victims on the anniversary of the 2001 attacks which resulted in the deaths of nearly 3,000 people after two hijacked planes crashed into the World Trade Center, one into the Pentagon in Arlington, Virginia and one crash landed in Shanksville, Pennsylvania

Friends and family members gather at the 9/11 Memorial during ceremonies marking the 12th anniversary of the 9/11 attacks on the World Trade Center in New York

President Barack Obama, First Lady Michelle Obama, Vice President Joe Biden and Jill Biden observe a moment of silence to mark the 12th anniversary of the 9/11 attacks on the South Lawn of the White House in Washington

Obama, along with first lady Michelle Obama, Vice President Joe Biden and wife Jill Biden, walked out of the White House at 8:46 a.m., EDT, the moment the first plane hit the World Trade Center tower in New York a dozen years ago

Steven Campbell pauses on September 11, 2013 to remember his wife Jill Maurer-Campbell during the 9/11 Memorial ceremonies

Antoni Cortes, and his wife Grace clean a portrait of their daughter Adrianed Oyola as they pay their respect to her at the South Pool at the 9/11 Memorial during ceremony marking the 12th anniversary of the 9/11 attacks

Hector Garcia of Brooklyn and his daughter Tania hold a placard with a photo of their daughter and sister Marlyn who died in the attacks as they attend ceremonies for the twelfth anniversary of the terrorist attacks on lower Manhattan at the World Trade Center site

9/11 12TH ANNIVERSARY: THE HEROES OF FLIGHT 93 ARE REMEMBERED IN PENNSYLVANIA

Visitors to the Flight 93 National Memorial participate in a sunset ceremony with a giant flag memorializing Flight 93 on Tuesday

In Pennsylvania at 10:03 a.m., bells were rung and names of passengers and crew members were read at the Flight 93 National Memorial.

The families of the passengers and crew aboard United Flight 93 recalled their loved ones as heroes who made history with unselfish and quick actions.

'In a period of 22 minutes, our loved ones made history,' said Gordon Felt, the president of the Families of Flight 93, whose brother, Edward, was among the 33 passengers and seven crew members aboard the hijacked plane on Sept. 11, 2001.

Families of those aboard the plane, along with nearly 200 more people, read the names aloud and bells tolled, as they marked the 12th anniversary of the Sept. 11 attacks.

Flight 93 was traveling from Newark, N.J., to San Francisco when it was hijacked with the likely goal of crashing it into the White House or Capitol.

As passenger Todd Beamer issued the rallying cry 'Let's roll,' he and several fellow passengers rushed down the airliner's aisle to try to overwhelm the hijackers after learning of the coordinated attacks on the World Trade Center and the Pentagon.

The 9/11 Commission concluded that the hijackers downed the plane as the hostages revolted.

As the names were read, a light haze began to burn off the surrounding hills. The memorial wall of white stone has each victim's name engraved on a separate panel, and the scene was framed by yellow wildflowers behind the stones.

U.S. Interior Secretary Sally Jewell recalled the sacrifice the passengers made.

'We never know when we'll be called to lay down our lives for others,' she said, speaking of the bravery of passengers and crew who fought back against the hijackers.

The reading of names and tolling of bells was the first part of the Flight 93 National Memorial's plans to honor the victims of the Sept. 11 attacks.

Later Wednesday, park rangers and volunteers will give presentations about Flight 93 and the creation of the memorial park, which is located in Shanksville, about 75 miles southeast of Pittsburgh.

A groundbreaking for a 6,800-square-foot visitor center was held Tuesday. The building will be broken in two at the point of the plane's flight path overhead. It is expected to open in late 2015.

The first features of the memorial in Shanksville were completed and dedicated in September 2011, including new roads and a Memorial Plaza near the crash site. Forty memorial groves of trees have also been planted, and large sections of the park have been replanted or reforested.

The tale of the courageous actions of everyday people aboard Flight 93 helped provide a measure of optimism for the American public in the dark days and weeks that followed the terrorist attacks.

It also inspired a 2006 docudrama, 'United 93,' the first big-screen dramatization about the terrorist attacks that used a cast of unknown actors and played out roughly in real time from the passenger check-in to the crash.

Visitors to the park have left more than 35,000 tributes at the site, and they have been collected as part of an archival collection.

Secretary of the Interior Sally Jewell, center, pauses as she places a lantern at the wall containing the 40 names of the crew and passengers of Flight 93 at the Flight 93 National Memorial on Tuesday

A photo of New York City Firefighter James Crawford who died during the attacks of September 11, 2001 was put there by his family as they came to participate in the 9/11 Memorial ceremonies marking the 12th anniversary

Relatives at the 9/11 Memorial during a ceremony marking the 12th anniversary of the 9/11 attacks on the World Trade Center in New York City

People walk along the 9/11 Memorial as the nation commemorates the anniversary of the 2001 attacks which resulted in the deaths of nearly 3,000 people after two hijacked planes crashed into the World Trade Center, one into the Pentagon in Arlington, Virginia and one crash landed in Shanksville, Pennsylvania

A woman walks along Hudson River at sunrise across from New York's Lower Manhattan and One World Trade Center in Liberty State Park in Jersey City, New Jersey, September 11, 2013

Tribute In Light: Two beams were lit on Tuesday behind the Statue of Liberty in preparation for today's anniversary

Iconic: The tribute shines above the Manhattan skyline. Today the names of almost 3,000 people killed in the World Trade Center and 9/11 attacks will be read out at ground zero

Stunning: The powerful Tribute In Light is one of a number of memorial plans for the 12th anniversary

Memorial: The light display commemorates the twin towers of the World Trade Center

Memorial: The tribute has been an annual fixture since 2010 after first being installed in 2002

Ring of light: The Tribute in Light can be seen rising above buildings in lower Manhattan, during a test on Tuesday

Focus: Memorial organizers are expected to take primary responsibility for the annual memorial from next year and say the families of victims will remain the focus of the ceremonies

Lighting up the city: The two columns, made up of 88 searchlights, was originally installed in 2002 by New York's Municipal Art Society

For everyone: On clear nights, the lights can be seen from over 60 miles away and visible to all of New York City

In the distance: A Brooklyn subway passes over a bridge as New York City's Tribute In Light shines in the background

The world mourns: New York will host a memorial at ground zero and ceremonies will be held across the U.S. and the globe

9/11: Nearly 3,000 people died when four hijacked planes were used in coordinated strikes on the Pentagon and the World Trade Center towers (pictured). The fourth plane crashed in Pennsylvania

Poignant: 3,000 flags are placed in memory of those killed on September 11 at a park in Winnetka, Illinois

Fitting: The flags represent each person killed in the coordinated strikes on the U.S. 12 years ago