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The person is last of three Saudi officials referred to in FBI report into the 2001 attacks that killed nearly 3 000.
18 years ago, the United States changed forever.
Family members gathered during the official ceremony marking the 10th anniversary of the terrorist attacks.
Watch a timeline of events as this significant day in history unfolded.
It took years of painstaking intelligence and analysis to find Osama bin Laden in Pakistan.
Thousands flocked to Ground Zero to celebrate the death of Osama bin Laden.
The mastermind behind the 9/11 attacks was found in a small village in Pakistan.
Obama laid a wreath on a trip to New York to bring closure to 9/11 families.
The Saudi government has long denied involvement in the 2001 attacks, in which hijacked airplanes crashed into New York's World Trade Centre, the Pentagon outside Washington, DC, and a Pennsylvania field. Nearly 3 000 people died.
The remains of a man killed at the World Trade Centre on 9/11 have been identified nearly 16 years after the terror attacks.
A chapel that sheltered 9/11 first responders may fall victim itself to the prosperity of its resurgent New York City neighbourhood.
The self-proclaimed mastermind of the September 11 attacks has written to former US president Barack Obama to tell him 9/11 was a direct result of American foreign policy and the deaths of innocent people it has caused.
Senator Chuck Schumer says Hillary Clinton seemed "fine" just before she left the 9/11 memorial ceremony and was captured on video appearing to struggle to stay on her feet.
Hillary Clinton's presidential campaign has been dealt another headache after the Democratic nominee left a 9/11 memorial ceremony in New York early, after feeling unwell.
President Barack Obama, speaking at the Pentagon, has said he is inspired by the resilience of the families of the victims of the 9/11 attacks.
The US has commemorated the 15th anniversary of the 9/11 attacks with a moment of silence observed in sombre remembrance at Ground Zero in New York, where nearly 3 000 people were killed.
The House has approved a bipartisan bill that would allow families of September 11 victims to sue the government of Saudi Arabia.
An American flag that firefighters had raised at ground zero in the hours after the 9/11 terror attacks, is set to return to the World Trade Center site after disappearing for more than a decade.
Nearly 15 years after the September 11 terror attacks, a funeral is being held for a New York City fire chief who died in the collapse of the World Trade Centre.
A Palestinian not seen publicly since his 2002 capture by the CIA launched a brutal interrogation programme, may soon make his first appearance in a US courtroom.
The US Senate approved legislation that would allow 9/11 victims and their relatives to sue Saudi Arabia over its possible role in the 2001 attacks, a bill which could trigger a diplomatic firestorm.
CIA Director John Brennan says a 28-page secret chapter from a congressional inquiry into 9/11 contains preliminary information about possible Saudi links.
The Obama administration will likely soon release at least part of a 28-page secret chapter from a congressional inquiry into 9/11 that may shed light on possible Saudi connections to the attackers
An old video of the 9/11 terrorist attack that was published in October 2009 has gone viral again. Watch the video here:
Jakarta says it wants to ensure that an alleged terror chief being held at Guantanamo Bay, Cuba, doesn't return to Indonesia under President Barack Obama plan to close Gitmo.
Seven years into his presidency, Barack Obama is set to make his first trip to an American mosque, offering a high-profile rebuttal of harsh Republican election-year rhetoric against Muslims.
The horror of September 11 2001 has dominated proceedings in a Guantanamo Bay military court, a stark contrast from previous days of rambling testimony that strayed far from the events of 14 years ago.
Republican frontrunner Donald Trump has called for the return of waterboarding, a near-drowning interrogation technique widely denounced as torture, saying it was "peanuts" compared to what ISIS is doing.
Relatives have assembled under overcast skies to commemorate nearly 3 000 people killed in the 9/11 attacks in New York, Pennsylvania and outside Washington 14 years ago, when airliners hijacked by al-Qaeda militants brought death, mayhem and destruction.
The Federal Bureau of Investigation says that it has picked up no 'specific or credible threats' linked to the anniversary of the September 11 2001 attacks.
An attorney for Saudi Arabia says that nation had nothing to do with the 9/11 attacks and should be dismissed as a defendant in lawsuits brought by victims' families.
Bin Laden will have to answer to God, the Vatican says.
An undercover FBI agent helped thwart a jihadist plot to attack targets including New York's subway and Times Square, authorities have announced in unsealing the charges.
A US military judge has put pretrial hearings in the September 11 terrorism case at Guantanamo Bay on an indefinite hold amid a dispute with officials over the way he travels to the remote courtroom.
Family members of 9/11 families and others harmed in the attacks are on a fresh quest to hold Saudi Arabia responsible.
The House has passed legislation to temporarily halt the transfer of more detainees from America's Guantanamo Bay prison.
Democratic presidential nominee Hillary Clinton is said to have "fainted" as she left a 9/11 event early. Video taken at the scene and posted on social media shows Clinton being held up by three people. She staggers and appears to trip on a curb as they help her into a vehicle.
The US has marked the 15th anniversary of 9/11 with victims' relatives reading their names and reflecting on a loss that still feels immediate to many of them.
The author was preparing for her wedding on 9/11. What followed was a journey through the US and the American psyche.
The mother of Mohammed Atta, one of the kamikaze hijackers who destroyed the World Trade Center, has said in an interview she believes her son is alive at the US prison in Guantanamo Bay.
The US military has closed a maximum-security detention centre at Guantanamo Bay, an official says, as the controversial military prison's population continues to shrink.
A Palestinian not seen publicly since his capture by the CIA in 2002, has appeared at a US government hearing called to determine whether he should remain in detention at the US military prison at Guantanamo Bay, Cuba.
In the wake of the Orlando shooting, Hillary Clinton is calling on Americans to "get back to the spirit of 9/12", the day after the worst attacks on US soil, when Americans came together with the world to condemn terrorism.
French authorities have tightened security at Paris airports since last year's attacks in the city, with thousands of border police officers, custom personnel, soldiers and private guards patrolling daily in the three airports serving the French capital.
Sarah Rudder was on the verge of a key promotion in the US Marines on 9/11 when the terrorist attacks struck and eventually left her without a leg.
Officials at the September 11 memorial in New York City say one of their security guards shouldn't have stopped a North Carolina middle school choir from singing the national anthem.
Democratic presidential contender Bernie Sanders is backing legislation that will let Americans sue Saudi Arabia over the 9/11 terrorist attacks.
A government review board looking at Guantanamo prisoners who were previously determined to be "too dangerous to release", has approved freeing 19 of the first 23 cases it considered.
In his last will and testament, al-Qaeda leader Osama bin Laden claimed he had about $29m in personal wealth - most of which he wanted to be used "on jihad, for the sake of Allah".
European and UN human rights experts have urged US President Barack Obama to shut down the controversial Guantanamo Bay prison camp, arguing that its operation undermines the fight against terrorism.
Former US president George W Bush and a raft of senior officials from his administration should be investigated for conspiracy to torture, HRW says.
A US judge has dismissed claims against Saudi Arabia by families of victims of the September 11, 2001 attacks, who accused the country of providing material support to al-Qaeda.
The US marks 14 years since the September 11 2001 terrorist attacks, with ceremonies including a memorial service at the newly opened visitor centre at the rural Pennsylvania site where one of four hijacked airliners crashed.
A memorial has been opened to honour the victims of United Airlines Flight 93, a plane hijacked during the September 11 2001 terrorist attacks, that passengers apparently crashed in rural Pennsylvania to thwart an attack on Washington.
Key developments in the long hunt for al-Qaeda leader Osama bin Laden.
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