Graphic detailing how events unfolded in the United States during the September 11 attacks.
US President Donald Trump struck a somber tone Friday on the anniversary of the 11 September, 2001 attacks as his Democratic rival Joe Biden comforted relatives of victims - in dueling bids to unite a deeply-divided nation.
Friday marks the 19th anniversary of the September 11 terror attacks on the United States.
A new memorial honours the passengers and crew who died on United Flight 93.
President Donald Trump will be accompanied by his wife Melania on a day that has come to symbolise national unity.
So far, only 1,642 of the 2,753 people who died in the attacks in New York have been formally identified.
A US led intervention sparked by the 11 September attacks toppled the Taliban government in 2001.
The House of Representatives voted 348-77 against the veto, hours after the Senate rejected it 97-1.
We need to avoid an overreaction that ends up polarising society, deepening divisions and making things worse.
How US raided Osama bin Laden's compound in Bilal Town
Former Senator Bob Graham, a Florida Democrat, has been pressing for the release of the information.
The names of those killed will be read out at the empty footprint of the World Trade Centre Twin Towers.
On Tuesday the US embassy warned Americans in South Africa about a possible terrorist attack.
Americans commemorated the anniversary of the attacks by observing moments of silence for those killed.
Rebuilding efforts at the site, where 2,753 people died, are nearing completion.
