Congolese security forces on Tuesday tried to slow the advance of Rwanda-backed M23 rebels who say they have captured Goma after

The rebels, which Rwanda denies supporting, have long been funded at least in part by the illicit mineral trade.

Fighting across the largest city in eastern Democratic Republic of Congo and "is still very much ongoing ... it's not over yet," senior U.N. official in Congo, Bruno Lemarquis, said on Monday after Rwandan-backed M23 rebels claimed to have control of Goma.

After a lightning offensive, M23 rebels now control Goma, a large city in the eastern Democratic Republic of Congo.

Kigali’s support of former Democratic Republic of Congo president Joseph Kabila could complicate peace talks, while Goma, the capital of North Kivu Province, is under siege by the M23.

In the capital, Kinshasa, protesters complaining of a lack of international action attacked foreign embassies, including those of the U.S., France and Rwanda.

The president of crisis-hit Democratic Republic of Congo was set to meet his Rwandan counterpart at an emergency summit on Wednesday, as fighters backed by Kigali appeared on the brink of seizing the key city of Goma.

LONDON (Reuters) - Britain has warned Rwanda that its involvement in an escalating conflict in the Democratic Republic of Congo could jeopardise the over $1 billion of aid it receives every year.

Speaking to BBC Newshour while being locked down in a UN bunker in the city, the deputy head of the UN force, Vivian van de Perre, said the M23 rebels had "established" themselves in Goma, but were still facing "pockets of resistance".

Kenya has announced a virtual crisis summit, but Congolese state media says President Felix Tshisekedi will not attend.

Residents of the besieged city of Goma, in the east of the Democratic Republic of Congo, say they are gripped by fear as gunshots continue to ring out around their homes, days after rebel forces claimed they had taken over.