Just 15 days before the 9/11 attacks, a well-connected Saudi family suddenly abandoned their luxury home in Sarasota, Fla., leaving behind jewelry, clothes, opulent furniture, a driveway full of cars — including a brand new Chrysler PT Cruiser — and even a refrigerator full of food.

About the only thing not left behind was a forwarding address. The occupants simply vanished without notifying their neighbors, realtor or even mail carrier.

The 3,300-square-foot home on Escondito Circle belonged to Esam Ghazzawi, a Saudi adviser to the nephew of then-King Fahd. But at the time, it was occupied by his daughter and son-in-law, who beat a hasty retreat back to Saudi Arabia just two weeks before the attacks after nearly a six-year stay here.

Neighbors took note of the troubling coincidence and called the FBI, which opened an investigation that led to the startling discovery that at least one “family member” trained at the same flight school as some of the 9/11 hijackers in nearby Venice, Fla.

The investigation into the prominent Saudi family’s ties to the hijackers started on Sept. 19, 2001, and remained active for several years. It was led by the FBI’s Tampa field office but also involved the bureau’s field offices in New York and Washington, and also the Southwest Florida Domestic Security Task Force.

Agents identified persons of interest in the case, establishing their ties to other terrorists, sympathies with Osama bin Laden and anti-American remarks. They looked into their bank accounts, colleges and places of employment. They tracked at least one suspect’s re-entry into the US.

The Saudi-9/11 connection in Florida was no small part of the overall 9/11 investigation. Yet it was never shared with Congress. Nor was it mentioned in the 9/11 Commission Report.

Now it’s being whitewashed again, in a newly released report by the 9/11 Review Commission, set up last year by Congress to assess “any evidence now known to the FBI that was not considered by the 9/11 Commission.” Though the FBI acknowledges the Saudi family was investigated, it maintains the probe was a dead end.

The review panel highlighted one local FBI report generated from the investigation that said Abdulaziz and Anoud al-Hijji, the prominent Saudi couple who “fled” their home, had “many connections” to “individuals associated with the terrorist attacks on 9/11/2001.”

But: “The FBI told the Review Commission that the communication was ‘poorly written’ and wholly unsubstantiated,” the panel noted in its 128-page report. “When questioned later by others in the FBI, the special agent who wrote (it) was unable to provide any basis for the contents of the document or explain why he wrote it as he did.”

How strange. Yet panelists did not interview the unidentified agent for themselves. They just accepted headquarters’ impeachment of his work.

Odder still, the agent’s report was just one of many other FBI communications detailing ties between the Saudi family and the hijackers. In fact, the Tampa office of the FBI recently was ordered to turn over more than 80,000 pages of documents filling some 27 boxes from its 9/11 investigation to a federal judge hearing a Freedom of Information Act case filed by local journalists over the Sarasota angle. The judge is sorting through the boxes to determine which documents should remain classified. Most are marked “SECRET/NOFORN,” meaning no foreign nationals — a classification reserved for highly sensitive materials.

“The report provides no plausible explanation for the contradiction between the FBI’s current claim that it found nothing and its 2002 memo finding ‘many connections’ between the Sarasota family and the 9/11 terrorists,” Thomas Julin, the attorney who filed the FOIA lawsuit against the FBI, told the Miami Herald.

The panel’s report also doesn’t explain why visitor security logs for the gated Sarasota community and photos of license tags matched vehicles driven by the hijackers, including 9/11 ringleader Mohamed Atta.

The three-member review panel was appointed by FBI Director James Comey, who also officially released the findings.

Former Democratic Sen. Bob Graham, who in 2002 chaired the congressional Joint Inquiry into 9/11, maintains the FBI is covering up a Saudi support cell in Sarasota for the hijackers. He says the al-Hijjis’ “urgent” pre-9/11 exit suggests “someone may have tipped them off” about the coming attacks.

Graham has been working with a 14-member group in Congress to urge President Obama to declassify 28 pages of the final report of his inquiry which were originally redacted, wholesale, by President George W. Bush.

“The 28 pages primarily relate to who financed 9/11, and they point a very strong finger at Saudi Arabia as being the principal financier,” he said, adding, “I am speaking of the kingdom,” or government, of Saudi Arabia, not just wealthy individual Saudi donors.

Sources who have read the censored Saudi section say it cites CIA and FBI case files that directly implicate officials of the Saudi Embassy in Washington and its consulate in Los Angeles in the attacks — which, if true, would make 9/11 not just an act of terrorism, but an act of war by a foreign government. The section allegedly identifies high-level Saudi officials and intelligence agents by name, and details their financial transactions and other dealings with the San Diego hijackers. It zeroes in on the Islamic Affairs Department of the Saudi Embassy, among other Saudi entities.

The review commission, however, concludes there is “no evidence” that any Saudi official provided assistance to the hijackers, even though the panel failed to interview Graham or his two key investigators — former Justice Department attorney Dana Lesemann and FBI investigator Michael Jacobson — who ran down FBI leads tying Saudi officials to the San Diego hijackers and documented their findings in the 28 pages.

Graham smells a rat: “This is a pervasive pattern of covering up the role of Saudi Arabia in 9/11 by all of the agencies of the federal government which have access to information that might illuminate Saudi Arabia’s role in 9/11.”

Paul Sperry is a Hoover Institution media fellow and author of “Infiltration: How Muslim Spies and Subversives Have Penetrated Washington.”