African leaders have called for an immediate ceasefire in the Democratic Republic of Congo and for UN peacekeepers to get greater powers.
After a summit in Nairobi on the crisis, they urged the creation of humanitarian corridors to help hundreds of thousands of displaced people.
UN Secretary General Ban Ki-moon has meanwhile warned that the conflict could engulf the wider region.
Unnamed UN officials say Angolans are fighting with government troops. New clashes between government and rebel forces have broken out near Goma.
Thousands of displaced people have fled in panic from a nearby camp, as the clashes continue. The UN force, Monuc, have deployed helicopters to try to contain the violence.