The plane broke up when it hit the runway as the pilot was trying to land amid heavy rain at about 1300 GMT, according to witnesses.
The plane had reportedly flown from the north-east of the country.
There has been no word so far on the cause of the incident, and the UN has yet to make an official comment.
A further 16 people were injured, a UN source told Reuters news agency.
"The plane landed heavily, broke into two and caught fire," said the source.
In September 1961, (Dag) HammarskjÃ¶ld (29 July 1905 â€“ 18 September 1961, the second Secretary-General of the United Nations) found out about the fighting between "non-combatant" UN forces and Katangese troops of Moise Tshombe. He was en route to negotiate a cease-fire on the night of 17â€“18 September when his DC-6B airliner (SE-BDY) crashed near Ndola, Northern Rhodesia (now Zambia). For security reasons, the crew had filed no flight plan while a decoy aircraft (OO-RIC) went via a different route ahead of HammarskjÃ¶ld's aircraft. HammarskjÃ¶ld and fifteen others perished in the crash. The chief of security on the flight, American Sgt. Harold Julian, was thrown clear of the burnt area, but died five days later.