What the CIA knew about Lee Harvey Oswald's 1963 visit to Mexico has become one of the most closely guarded secrets in the agency's history.

Only hours after shots rang out in Dealey Plaza on November 22, 1963, U.S. Ambassador Thomas C. Mann told colleagues in the American embassy in Mexico that he was certain Lee Harvey Oswald had not ...

Part of a file from the CIA, dated Oct. 10, 1963, details "a reliable and sensitive source in Mexico" report of Lee Harvey Oswald's contact with the Soviet Union embassy in Mexico City, that was ...

In September 1963, weeks before the assassination of President John F. Kennedy, Lee Harvey Oswald made a now-infamous trip to Mexico City. This brief but puzzling trip fueled countless theories ...

Lee Harvey Oswald was a KGB associate who was personally instructed by Soviet leader Nikita Khrushchev to assassinate President Kennedy. Sometime shortly thereafter, the Soviets changed their minds… ...

Just a few weeks before killing President John F. Kennedy in November 1963, Lee Harvey Oswald traveled to Mexico City, where he spoke with a KGB officer at the Soviet Embassy, a new document ...

While CIA agents had picked up on Oswald while he was in Mexico City in September 1963 trying to return to the Soviet Union, where he had defected in 1959, they did not pay much attention to him ...

Part of a file from the CIA, dated Oct. 10, 1963, details "a reliable and sensitive source in Mexico" report of Lee Harvey Oswald's contact with the Soviet Union embassy in Mexico City, that was ...

In this combination image, Booking photo of American Marxist and former US Marine Lee Harvey Oswald (1939 - 1963) after he was arrested for assassinating President John F Kennedy in Dallas, 23rd ...

The CIA station in Mexico City intercepted a phone call Lee Harvey Oswald made to the Soviet Union embassy in Mexico City on Oct. 1 1963. According to the document, Oswald spoke in broken Russian ...

An expert says someone might have known about Lee Harvey Oswald's plans to kill JFK before his 1963 assassination. The latest instalment of files released also shows the Mexican president helped ...