There were several inquiries into the crash in 1961-2 (i.e. by the Board of Investigation, The Rhodesian Commission of Inquiry), which ultimately identified pilot error as the likely cause of the crash. The conclusions were made based on elimination of other suggested causes. Criticism was raised over the failure of the inquiries to take the testimonies of Zambian witnesses seriously.
A UN inquiry in 1962, however, reached an open verdict and stated that it could not rule out sabotage or attack. This led the UN General Assembly to pass a resolution on 26 October 1962 (GA/RES 1759), requesting the Secretary-General “to inform the General Assembly of any new evidence which may come to his attention.”