Heavy gunfire resonated across the key eastern Congolese city of Goma on Sunday from the frontline just a few kilometres away.

The Democratic Republic of Congo and Rwanda have broken off diplomatic ties after an escalation in fighting in eastern Congo near the border with its neighbour.

Gunshots rang out Sunday night in the centre of the besieged Congolese city of Goma, AFP journalists heard, after the Democratic Republic of Congo accused Rwanda of sending fresh troops

United Nations chief Antonio Guterres on Sunday urged Rwanda to withdraw its forces from the eastern Democratic Republic of Congo where fierce fighting raged as Kigali-backed fighters closed in on the major city of Goma.

The Democratic Republic of Congo on Sunday called for the United Nations to sanction Rwanda, accusing its neighbour of issuing a "declaration of war" by sending more troops over the

Gunfire broke out before dawn Monday in the centre of the besieged Congolese city of Goma, after the Democratic Republic of Congo accused neighbouring Rwanda of sending more troops across

A U.N. official says Congolese rebels and allied Rwandan forces have entered the outskirts of Goma and the airport in the key eastern city is no longer in use.