Former FBI agent who worked on still-secret FBI 9/11 case says hijackers had U.S.-based support network

President Biden signed an executive order Friday directing the Department of Justice to oversee a declassification review of some documents related to the 9/11 attacks, amid pressure from families of victims who are demanding to know if Saudi Arabia helped the hijackers. The order requires the attorney general to release any declassified documents in the next six months. 

Some records pertain to a still-secret investigation, code named "Operation Encore," which centered on the two hijackers that lived in San Diego and who may have assisted them. While it could take months for the documents to be released, Danny Gonzalez, a former FBI agent who worked on the operation, told CBS News that he's confident two of the hijackers had a U.S.-based support network.  "19 hijackers cannot commit 3,000 mass murders by themselves," Gonzalez said in his first television interview about the investigation.