The CIA reports, which were declassified last fall, claim that then-agency head John McCone and other top officials were part of a 'benign cover-up' surrounding the assassination of Kennedy in November 1963.

The report's author, CIA historian David Robarge, claims McCone withheld information to keep the Warren Commission focused on what the agency believed to by the 'best truth… that Lee Harvey Oswald, for as yet undetermined motives, had acted alone,' according to Politico.

McCone and others were 'complicit' in keeping 'incendiary' information from the Warren Commission, a group established in the days after Kennedy's assassination by President Lyndon B Johnson to investigate the incident.

The investigators were officially known at the President's Commission on the Assassination of President Kennedy.