Correspondent Greg Barrow reports from South Africa

The warning was delivered at a meeting of the Non-Aligned Movement in the South African city of Durban.

The Rwandan foreign minister, Anastase Gasana, accused Congo's President Laurent Kabila of training a 10,000-strong militia, including elements of the former Rwandan regime which carried out the 1994 genocide of Tutsis and moderate Hutus.

Meanwhile, the Democratic Republic of Congo tabled a resolution condemning Rwanda and Uganda for what it calls their aggression on its territory.

Rebels fight on

In another development, President Kabila visited the Zimbabwean president Robert Mugabe for several hours.

The BBC's correspondent in Harare, Joseph Winter, said the meeting was to determine the next steps to take in the war against the Congolese rebels.

Zimbabwe, Angola and Namibia are backing President Kabila's government in the conflict while the rebels are allied to Uganda and Rwanda.

The rebels have said they will continue fighting despite reports they have been forced to withdraw from strategic locations around the capital, Kinshasa.

The Inga dam: recaptured from the rebels

They are reported to have pulled out of the main port of Matadi. The rebels have also withdrawn from the Inga hydro-electric dam which supplies power to Kinshasa.

It is thought the rebels handed over the dam after being surrounded by Angolan troops.

However, despite the government successes, the capital is still without electricity and the rebels maintain their hold over main cities in the east.

'Lynch mobs' attack Tutsis

The Congolese government says its troops spent Saturday carrying out mopping up operations in Kinshasa after three days of fighting with rebels.

But while the government said its troops were attempting to restore order, there have been increasing reports of murders of suspected Tutsi rebels.

A source in Kinshasa said there had been summary executions of young men resembling Tutsis.

One man was said to have been beaten to death and his body set alight in front of a cheering crowd.

Another incident saw a suspect thrown from a bridge and then shot.

Regional relations sour

The reported killings are adding to fears that the fighting in Congo could suck the entire region into a conflict based on ethnic hatred.

The Congolese Government says thse POWs are Rwandan soldiers

The Congolese Government has said it has proof that outside forces are fighting alongside the rebels, and paraded alleged prisoners of war in front of journalists, saying the men had admitted to being Rwandans.

Uganda has admitted its troops are operating deep inside the Congo, but says they are just protecting national interests and are not involved directly in the conflict.

Zimbabwean officials have accused South Africa of supplying much of the equipment to Uganda and Rwanda, who in turn, they say, passed it on to the rebels.