WASHINGTON — Newly released government documents regarding John F. Kennedy’s assassination say allegations that Lee Harvey Oswald was connected to the CIA were “totally unfounded.”

A 1975 CIA memo says a thorough search of agency records in and outside the United States was conducted to determine whether Oswald had been used by the agency or connected with it in “any conceivable way.”

The memo said the search came up empty. The memo also said there was also no indication that any other U.S. agency used Oswald as a source or for recruitment.

The National Archives released another 676 government documents related to the assassination on Friday — the third public release so far this year. Under law, all the documents were to be disclosed to the public last week.

Most of the latest release comprises 553 records from the CIA that previously were withheld in their entirety. There also are records from the Justice and Defense departments, the House Select Committee on Assassinations and the National Archives.

University of Virginia historian Larry Sabato complained that many of the documents in the latest release were still heavily redacted. He tweeted about a 144-page record, titled “Material Reviewed at CIA headquarters by House Select Committee on Assassinations staff members,” that had writing on only a handful of pages.

President Donald Trump has ordered the release of all records related to the assassination, and they are expected to be made public on a rolling basis during the next three to four weeks. He also directed agencies to take another look at redactions and withhold information only in the rarest of circumstances.

One record showed how U.S. officials scrambled after the assassination to round up information about Oswald’s trip to Mexico City weeks earlier. Officials wondered whether Oswald had been trying to get visas at the Soviet and Cuban embassies in Mexico City in order to “make a quick escape after assassinating the president.”