US Congress has unanimously passed a Bill allowing 9/11 victims' families to sue the Saudi government, on the eve of the attacks' 15th anniversary. The House of Representatives held a voice vote on legislation that the Senate approved in May.
Saudi Arabia, a key US ally, has denied any role in the attacks. The Saudi Foreign Minister said the bill would strip the principle of sovereign immunity.
Riyadh has also threatened to pull hundreds of billions of dollars from the US economy if the Justice Against Sponsors of Terrorism Act was enacted.
Riyadh has never been formally implicated in the 11 September 2001 attacks. But the Congress released 28 declassified pages from a report two months ago which reignited concerns a few of the attackers had links to Saudi government officials.