In 1991 , following reports in the British press about a Belgian mercenary who claimed he shot down Dag Hammarskjöld 's plane on 18 September 1961 ( while Rösiö served as consul in Léopoldville ) , the Swedish government decided to launch a one-man inquiry which was conducted by Rösiö . He pointed out a number of questions in previous reports , but came to the conclusion that the cause of the crash was indisputably pilot error . Claims of the fuselage being riddled with bullet holes were false , a fact to which he could attest since he was one of the first people to inspect the wreckage . He also proved that accounts by mercenaries contained glaring inconsistencies ( the fuel tanks of their planes were far too small to cover the distances they claimed ) . Since the report was submitted in 1993 it has served as Sweden 's official stance on what happened in Ndola
down Dag Hammarskjöld 's plane
1961 Ndola United Nations DC-6 crash
Bengt Rösiö