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President Joe Biden has once again delayed the public release of thousands of government secrets that might shed light on the 1963 assassination of President John F. Kennedy.

“Temporary continued postponement is necessary to protect against identifiable harm to the military defense, intelligence operations, law enforcement, or the conduct of foreign relations that is of such gravity that it outweighs the public interest in immediate disclosure,” Biden wrote in a presidential memorandum late Friday.

He also said that the National Archives and Records Administration, the custodian of the records, needs more time to conduct a declassification review due to delays caused by the coronavirus pandemic.

The decision, which follows a delay ordered by President Donald Trump in 2017, means scholars and the public will have to wait even longer to see what remains buried in government archives about one of the greatest political mysteries of the 20th century. And the review process for the remaining documents means Biden can hold the release further if the CIA or other agencies can convince him they reveal sensitive sources or methods.

Public opinion polls have long indicated most Americans do not believe the official conclusion by the Warren Commission that the assassination was the work of a single gunman, Lee Harvey Oswald, a former Marine who once defected to the Soviet Union and who was shot to death by a nightclub owner Jack Ruby while in police custody.

A special House committee in 1978 concluded “on the basis of the evidence available to it, that President John F. Kennedy was probably assassinated as a result of a conspiracy.”