I have researched the crash based on accident report and anything as close to primary documents as possible that I was able to find. Few years ago my article has been published in Polish, I would gladly publish it in English, but I do not know where to. Hammarskjold's aircraft was not shot down, that for sure. Katangan AF had no capability to intercept the aircraft over Ndola, and above all had no reason to do so. My impression is, that the investigation was turned down, as important witness testimonies were rejected as 'not credible'. If this was assassination, then it was done in another way, by misleading the aircraft into a wrong place. I am not sure if this can be proven legally though.