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

Troops from Democratic Republic of Congo and Rwanda have been firing at each other across their shared border in the eastern Congolese city of Goma, where Rwandan-backed rebels launched an offensive,

Rebels in Democratic Republic of Congo are closing in on a key city in the mineral-rich region aided by neighboring Rwanda’s army, the head of a peacekeeping mission told United Nations Security Council members during an emergency meeting on Sunday.

Residents in eastern Congo’s largest city of Goma are fleeing after Rwanda-backed rebels claimed to have captured the regional hub from Congolese forces.

The Congolese army and peacekeepers are trying to stop an M23 advance on Goma, the capital of North Kivu province.

Footage shows troops, some in army uniform, handing over arms to Rwandan security officers after crossing into eastern neighboring country at the main border crossing in Rwanda's Rubavu district - Ana

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

Rwandan backed rebels have entered the city of Goma, a key city in neighboring Democratic Republic of Congo. Could the mineral rich region be in danger of tipping into all out regional conflict?

The UN Security Council denounced the "flagrant disregard" for the sovereignty and territorial integrity of the Democratic Republic of Congo (DRC), demanding the withdrawal of "external forces" without explicitly naming them.

Rebels claim to have captured the key city of Goma in the DRC, as the decades-long conflict becomes even more volatile. Sky News takes a look at what's going on.

The M23 armed group and Rwandan soldiers entered the centre of Goma on Sunday night after weeks of advancing on the main city in the Democratic Republic of Congo's North Kivu province.