By JOHN HANNA AND JAMIE STENGLE | THE ASSOCIATED PRESS

DALLAS - Newly released documents related to President John F. Kennedy's assassination in 1963 gave curious readers more details Wednesday into Cold War-era covert U.S. operations in other nations but didn't initially lend credence to long-circulating conspiracy theories about who killed JFK.

Assessments of the roughly 2,200 files posted by the U.S. National Archives and Records Administration on its website came with a huge caveat: No one had enough time as of Wednesday to review more than a small fraction of them. The vast majority of the National Archives' more than 6 million pages of records, photographs, motion pictures, sound recordings and artifacts related to the assassination have previously been released.

An initial Associated Press review of more than 63,000 pages of records released this week shows that some were not directly related to the assassination but rather dealt with covert CIA operations, particularly in Cuba. And nothing in the first documents examined undercut the conclusion that Kennedy assassin Lee Harvey Oswald was the lone gunman in Dallas on Nov. 22, 1963.

"Nothing points to a second gunman," said Philip Shenon, who wrote a 2013 book about the assassination. "I haven't seen any big blockbusters that rewrite the essential history of the assassination, but it is very early."

Kennedy was killed on a visit to Dallas, when his motorcade was finishing its parade route downtown and shots rang out from the Texas School Book Depository building. Police arrested the 24-year-old Oswald, a former Marine who had positioned himself from a sniper's perch on the sixth floor. Two days later Jack Ruby, a nightclub owner, fatally shot Oswald during a jail transfer broadcast live on television.

A year after the assassination, the Warren Commission, established by President Lyndon B. Johnson to investigate, concluded that Oswald acted alone and there was no evidence of a conspiracy. But critics of the commission still spun a web of alternative theories.

Speculation about details surrounding Kennedy's assassination has been intense over the decades, generating countless conspiracy theories about multiple shooters and involvement by the Soviet Union, the mafia and the CIA. The new release fueled rampant speculation and sent people scurrying to read the documents and share online what they might mean.

The latest release of documents followed an order by President Donald Trump, though most of the records were made public previously with redactions. Before Tuesday, researchers had estimated that 3,000 to 3,500 files were still unreleased, either wholly or partially. Last month, the FBI said it had discovered about 2,400 new records related to the assassination.

A version of that memo released in 2023 redacted the name of the CIA's security contact on Oswald in Mexico, as well as the identity of someone behind the "penetration of the Cuban embassy" there. The latest version shows that the security contact was the president of Mexico in 1975, Luis Echeverria Alvarez, who died in 2022, and that the Mexican government itself penetrated the Cuban embassy.