All sides in eastern DR Congo have committed serious human rights abuses, the UN secretary general has said.
Ban Ki-moon said both government forces and rebels loyal to Gen Laurent Nkunda had carried out arbitrary executions, mass killings, rape and torture.
The report covers July to November, when the most recent fighting flared.
In a separate report, a rights group has accused the government of using violence to eliminate political opponents following polls in 2006.
Human Rights Watch (HRW) said Congolese security forces had deliberately killed more than 500 people in a campaign against opposition groups.
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DR Congo rebel leader Laurent Nkunda has told UN peace envoy Olusegun Obasanjo he will support a peace process with the government.
Evidence is increasing that foreign forces are being drawn into the conflict in the east of the Democratic Republic of Congo.
Eyewitnesses told the BBC Angolan and Zimbabwean troops were on the ground.
The history of Congo (and Africa, in general) is one of unbroken plundering by the outside world. And, history repeats more keenly in African than anywhere else.