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See photos and videos from 9/11 on 16th anniversary of terrorist attacks

See photos and videos from 9/11 on 16th anniversary of terrorist attacks

Sixteen years after the nation's deadliest terrorist attack, the relatives of those lost at the World Trade Center will gather once more at the National September 11 Memorial & Museum to honor the almost 3,000 people who were killed that day.

To this day, only 1,641 (or 60 per cent) of the 2,753 people who perished at the World Trade Centre have been positively identified, according to the medical examiner's office.

The sixteenth anniversary of the Nine Eleven terrorist attack in the United States is being observed today. American Airlines Flight 77 was crashed into the Pentagon in Arlington County, Virginia. Yvonne Thomas said the Flight 93 memorial has a calm about it that they do not see in New York City.

The display, marking 16 years since the attacks, consists of 88 7,000-watt lights set up on the roof of a parking garage near the Battery Park Tunnel - just blocks from where the World Trade Center's Twin Towers once stood.

Located in rural in Shanksville, Pennsylvania, the memorial commemorates the 40 passengers who sacrificed their own lives to wrest control away from the hijackers of United Flight 93, preventing the plane from hitting its intended target of the United States Capitol Building.

The Pentagon Memorial will also hold its anniversary commemoration and is the first national memorial dedicated to the terror attacks on 9/11.

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Americans commemorated 9/11 on Monday with tear-streaked tributes, a presidential warning to terrorists and appeals from victims' relatives for unity and hope 16 years after the deadliest terrorist attack on US soil.

The Flight 93 National Memorial's annual Luminaria and September 11 Observance took place on the evening of September 10, and on the morning of September 11, respectively.

Westley Thomas, who did two tours in Vietnam, worked on the World Trade Center construction.

The Museum honors the almost 3,000 victims of these attacks and all those who risked their lives to save others.

Polished aluminum chimes ranging from 5- to 10-feet-long - each tuned for different notes - will ring from the tower, driven by the wind to produce a memorializing melody, he said.