UN Secretary General Dag Hammarskjold served in the tumultuous period during which the colonial empires in Africa were being dismantled. He became known for bucking Western interests and for seeking conciliation with revolutionary pan-Africanist leaders.
In September 1961 the plane carrying the Secretary General and a delegation on a peace mission to the Congo exploded en route, killing all 16 aboard.
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http://www.guardian.co.uk/world/2011/aug/17/dag-hammarskjold-un-secretary-general-crashDag Hammarskjöld: evidence suggests UN chief's plane was shot down
Eyewitnesses claim a second aircraft fired at the plane raising questions of British cover-up over the 1961 crash and its causes
New evidence has emerged in one of the most enduring mysteries of United Nations and African history, suggesting that the plane carrying the UN secretary general Dag Hammarskjöld was shot down over Northern Rhodesia (now Zambia) 50 years ago, and the murder was covered up by British colonial authorities.
A British-run commission of inquiry blamed the crash in 1961 on pilot error and a later UN investigation largely rubber-stamped its findings. They ignored or downplayed witness testimony of villagers near the crash site which suggested foul play. The Guardian has talked to surviving witnesses who were never questioned by the official investigations and were too scared to come forward.
The residents on the western outskirts of the town of Ndola described Hammarskjöld's DC6 being shot down by a second, smaller aircraft. They say the crash site was sealed off by Northern Rhodesian security forces the next morning, hours before the wreckage was officially declared found, and they were ordered to leave the area.
http://news.bbc.co.uk/2/hi/africa/154384.stmThe South African Truth and Reconciliation Commission has released documents which it says point to a possible international plot to kill the United Nations' Secretary General, Dag Hammarskjold in 1961.
Mr Hammarskjold and 15 other people died when their plane exploded just before landing in Northern Rhodesia, now Zambia. He had been trying to mediate a peace agreement between Congo and the breakaway province of Katanga.
The commission says eight letters it uncovered during its investigation into apartheid-era crimes suggest South African, British and American secret services might have been involved.
BBC Correspondent Greg Barrow in South Africa says that at the time of the crash the Cold War superpowers were jostling for influence in the Congo and western governments were not entirely comfortable with Mr Hammarskjold's conciliatory approach to the demands of revolutionary African leaders.
'Hammarskjold should be removed'
The letters are said to record meetings between the South African military, the American CIA and Britain's MI5 security service. The letters are headed the South African Institute for Maritime Research (SAIMR) - thought to be a front company for the South African military.
One of the letters says: "In a meeting between MI5, special ops executive and the SAIMR, the following emerged _ it is felt that Hammarskjold should be removed." The undated letter says: "Allen Dulles
has promised full co-operation from his people."
Another document gives details of orders to plant explosives in the wheel bay of an aircraft. It says they were primed to go off as the wheels were retracted on takeoff.