It is at the request of relatives of the victims that Biden signs under the Presidential Order to publish the documents consisting of emails, letters, interrogation transcripts and secret reports.

- The documents may contain information linking the Saudi government to those who hijacked the plan, say the relatives and many of those injured in the attacks, says Stefan Åsberg, US correspondent.

Connections to Saudi Arabia

15 out of 19 aircraft makers during the terrorist attacks on September 11, 2001 were Saudis.

Many of those hard hit by the attacks do not believe the commission that concluded in 2004 that there were no proven links between the Saudi government and the hijackers.

Stefan Åsberg has met several relatives of the victims, including Brett Eagleson who lost his father on September 11, 2001.

- There are elements in the government that did very bad things and the Saudis looked away, they did not want to feel it.

They have never been held accountable for it and it is time now, 20 years later, that they do it, says Brett Eagleson.

Hope to get supporting evidence

A major lawsuit is underway in which the Saudi government is sued for billions of dollars by relatives of the victims of the attacks.

Evidence for their case means they can be found in the documents that will be published now over the course of six months.

"There is a perception among these relatives that US authorities are protecting Saudi Arabia because they are the most important ally in the Middle East and that the United States relies on Saudi oil," says Stefan Åsberg.

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See what it looked like the day of the deed, and hear the heartbreaking conversation from Flight 11. Photo: Patrick Sison, Amy Sancetta / TT, SVT Archive