Congolese rebels say they have “taken” the key city of Goma in the Democratic Republic of Congo (DRC).
The leader of a rebel alliance that includes the M23 group reiterated on Sunday that government forces had until 3am to surrender their weapons.
It comes after 13 soldiers serving with peacekeeping forces in the DRC were killed in clashes with the rebels, United Nations officials said.
Congolese rebels and allied Rwandan forces entered the key eastern city of Goma on Sunday and the airport is no longer in use, according to the DRC’s top UN official.
“M23 and Rwandan forces penetrated Munigi quarter in the outskirts of Goma city, causing mass panic and flight amongst the population,” said the UN’s special representative in the DRC, Bintu Keita, to an emergency UN meeting on Sunday.
The strategic city of Goma has a population of about two million people and is a regional hub for security and humanitarian efforts.
Eyewitness: Sky News team in DRC attacked as civilians flee
The M23 is mainly made up of ethnic Tutsis who broke away from the Congolese army more than a decade ago.
It’s one of about 100 armed groups that have been vying for a foothold in the mineral-rich region, where a long-running conflict has created one of the world’s largest humanitarian crises.
In recent weeks, it has made significant territorial gains.
The DRC has accused neighbouring Rwanda of fuelling the M23 rebellion and has now severed diplomatic ties with it.
Rwanda has denied the claims but last year admitted it has troops and missile systems in eastern Congo to safeguard its security, pointing to a build-up of Congolese forces near the border.
“Rwanda is trying to get in by all means, but we are holding firm,” a Congolese military source told the Reuters news agency on Sunday.
“It is war, there are losses everywhere… the population must remain calm, we are fighting,” they added.
The DRC has recalled its diplomats from Rwanda and asked Rwandan authorities to cease diplomatic and consular activities in the Congolese capital, Kinshasa.
A UN Security Council meeting to discuss the escalating violence was scheduled for Monday but was brought forward to Sunday.
During that meeting, France and the UK pressured Rwanda over its role in the conflict.
France called for Rwanda to withdraw its troops from Congo territory, while Britain called for an end to attacks on peacekeepers by M23 rebels receiving support from Rwanda.
It comes after a Congolese military governor was killed while on the frontline during a M23 offensive on Friday.
On Saturday, the Congolese army said it foiled an M23 offensive towards Goma with the help of its allied forces, including UN troops and soldiers from the Southern African Development Community Mission, also known as SAMIDRC.
The burning wreckage of a white armoured fighting vehicle carrying UN markings could be seen on a road between Goma and Sake.
South Africa said nine of its peacekeepers had been killed amid the surge in fighting during the last few days.
Three Malawians and a Uruguayan were also killed, the UN said.
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Decades of conflicts in the eastern DRC between rival armed groups over land and resources, and attacks on civilians, have killed hundreds of thousands of people and displaced more than seven million.
Militias also include the Cooperative for the Development of the Congo (CODECO) and the Allied Democratic Forces (ADF).
The UN peacekeeping force entered the DRC more than two decades ago and has around 14,000 soldiers on the ground.