The Federal Bureau of Investigation declassified a secret internal memo on its investigation into allegations that Saudi Arabia’s government provided assistance to the terrorists that carried out the Sept. 11 attacks on the United States.

» Remembering 9/11

The 16-page, partially redacted memo doesn’t draw any conclusion on the allegations, though it details links and contacts between the terrorists and Saudi nationals living in the U.S. at the time, including one of the country’s diplomats. The memo relates to contacts in the U.S. by Saudi-born Nawaf al-Hazmi and Khalid al-Mihdhar, who were among the hijackers who crashed a passenger jet into the Pentagon.

Families of 9/11 victims believe that the FBI suppressed or even destroyed evidence pointing to a more substantial connection between the terrorists who perpetrated the attacks, most of whom were Saudi Arabian, and the Saudi government.

The FBI’s release coincided with this past weekend’s commemorations of the 20th anniversary of the attacks.

President Joe Biden ordered the Justice Department this month to review the FBI’s investigation of the attacks and release declassified documents to the public over the next six months.

Saudi Arabia’s government has consistently denied having any role in the attacks.

In a statement, 9/11 Families United, a group representing families of victims of the attack, said the 2016 memo “puts to bed any doubts about Saudi complicity in the attacks.”

It implicates “numerous Saudi government officials, in a coordinated effort to mobilize an essential support network for the first arriving 9/11 hijackers,” the group added.

The families have long pressed for the FBI’s files to be declassified and publicly released. Some of the families believe that the FBI suppressed or even destroyed evidence pointing to a more substantial connection between the terrorists who perpetrated the attacks, most of whom were Saudi Arabian, and the Saudi government.

In a statement released on Sept. 8, Saudi Arabia’s embassy in Washington said it supports full declassification of any documents and materials relating to the U.S. investigation of the terrorist attacks and called charges that the nation was complicit in the strikes “categorically false.”

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