The US Congress is considering legislation which would enable the families of victims of the September 11 attacks to sue Saudi Arabia, presented by the West as its most valuable ally in the Middle East, over alleged links with al-Qaeda terrorists who carried out the attacks on New York and Washington.

The issue had cast a long shadow over the recent visit of President Barack Obama to Riyadh, with the Saudis threatening to sell off $750bn of American assets they hold if the bill is passed by Congress.

The classified pages are in a file titled “Finding, Discussion and Narrative Regarding Certain Sensitive Narrative Matters”, which have never been published from the findings of the Joint Congressional Inquiry into the attacks which killed 3,000 people and injured more than 6,000 others.

Former President George W Bush claimed the publication of this part of the report would damage America’s national security by revealing “sources and methods that would make it harder for us to win the War on Terror”.

But there is growing clamour for declassification of the pages along with allegations about attempts by the Saudis to keep their alleged role in the attacks hidden. The latest public figure to demand disclosure was Rudi Giuliani, the mayor of New York at the time of the attacks.

A Saudi prince, claimed Mr Giuliani, had given him a cheque for $10m (£7m) in an effort to persuade him to deflect attention away from the Kingdom. The former mayor said he returned the cheque after tearing it up. He declared: “His money he can keep and go burn it in hell. The American people need to know exactly what was the role of the Saudi Arabia government in the attacks: we are entitled to know who killed our loved ones and who almost killed us all.”

© Provided by The Independent The allegations of Saudi involvement in the attacks come against a backdrop of the ultra-conservative Kingdom’s funding violent Islamist groups (Picture: [copyright])

It was reported on Sunday that White House House officials have said privately that at least some of the 28 pages will be made public.

And former Democratic Senator Bob Graham, the former head of the Senate intelligence committee, reiterated his belief that Saudi Arabia was involved in the attacks at the highest level. He said “The most important unanswered question of 9/11 is: did these 19 people conduct this very sophisticated plot alone, or were they supported? So who was the most likely entity to have provided them that support? I think all the evidence points to Saudi Arabia. I think it covers a broad range, from the highest ranks of the Kingdom through these, what would be private entities.”

Two Congressmen, both of whom have seen the secret document, are behind the bipartisan motion for declassification. Stephen Lynch, a Massachusetts Democrat, held that the report offers evidence of links between “certain Saudi individuals” and the terrorists behind the 2001 attacks. Walter Jones, a Republican, said it also sheds light on why President Bush was so opposed to publication : “It’s about the Bush administration and its relationship with the Saudis.”

The allegations of Saudi involvement in the attacks come against a backdrop of the ultra-conservative Kingdom’s funding violent Islamist groups, often with the encouragement and support of the West. This continues now with accusations that the Saudis have supplied money and arms to the most extreme of the rebels fighting the regime of Bashar al-Assad in Syria.

The current round of exporting hardline, obscurantist Sunni doctrine from Saudi Arabia is traced back to 1992 when the country’s senior Wahaabi clerics issued a Memorandum of Advice to the royal family effectively threatening a putsch unless they were allowed to play a central role of the policies of the Kingdom both home and abroad.

The royal family felt unable to resist the demands and a key move in facilitating this was the creation of the Wahaabi dominated Ministry of Islamic Affairs, with representatives in Saudi embassies and consulates. The alleged links of the Ministry’s officials to the September 11 plotters is a key claim in the projected lawsuit.

Mr Giuliani’s charge of attempted bribery against the Saudi prince came a day after it was revealed that the flight certificate of an al-Qaeda bombmaker named Ghassan Al-Sharbi, who had taken flying lessons for the September 11 mission, was found in an envelope stashed away at the Saudi embassy in Washington.

The certificate, along with other documents was found at the embassy during investigations after he was captured in 2002 in Pakistan, which has become a conduit for Wahaabi-funded terrorism.

Al-Sharbi, who had not taken part in the September 11 attacks, has been held since at Guantanamo Bay. An official memo about the licence, called Document 17, written in 2003, was quietly declassified last year but did not come to public awareness until an activist, Brian McGlinchey, discovered and published it in his blog last week.

There was also a connection, it has emerged, between the Kingdom’s legations in America to two Saudis, Nawaf al-Hamzi and Khalid al-Mindhar, who had arrived in the US in 2000 as the part of the first wave of September 11 hijackers.

The two men were set up in an apartment in San Diego by Omar al-Bayoumi, a fellow Saudi, who also helped them with social security paperwork and information about flying courses. There were reports that he also introduced them to an imam, Anwar al-Awlaki, who later became known as the “Bin Laden of the internet” and was killed in an American drone strike in Yemen.

Al-Bayoumi received Saudi government funding for his stay in the US through a Saudi aviation services company called Dallah Alco. He was listed in FBI files before the September 11 attacks as a Saudi agent (something the authorities in the Kingdom deny) and was a frequent visitor to the Kingdom’s Washington embassy and consulate in Los Angeles.

Al-Bayoumi acknowledged to US investigators that he had an hour-long meeting with Fahad al-Thumairy, an official of the Ministry of Islamic Affairs, who he described as his spiritual mentor at the Saudi consulate in Los Angeles, the same day that he had met al-Hamzi and al-Mindhar. Two years later al-Thumairy was stripped of his diplomatic immunity and deported from the US because of suspected terrorist links.