Democratic Republic of Congo's M23 rebels are moving south towards Bukavu, the capital of South Kivu province, in what appears to be an attempt to expand their area of control in the country's east after capturing the city of Goma.

Missiles are flying above civilians' homes as fighters fire heavy artillery in Goma's city centre, an International Committee of the Red Cross (ICRC) spokesperson tells the BBC. "It is a very densely populated area... there are lots of victims in terms of civilians, Myriam Favier says.

Fighting has escalated sharply in recent weeks in eastern Congo, where rebels have seized key towns and are closing in on the city of Goma, the government’s last stronghold in the North Kivu province,

Members of the M23 rebel group gather to supervise Congolese potential recruits for the M23 rebel group before being taken to training centres run by M23 rebels, amid clashes between M23 rebels and the Armed Forces of the Democratic Republic of the Congo (FARDC),

Rwanda-backed rebels who have captured eastern Congo’s largest city say they plan to take their rebellion to the capital and seek to gain political power

The United Nations expressed deep concern at reports of M23 rebels and Rwandan troops advancing south towards the Congolese city of Bukavu on Thursday, as the militants sought also to assert their control over east Congo's largest city Goma.

Congolese President Félix Tshisekedi has vowed to restore government authority in the east, where Rwanda-backed M23 rebels have seized control of the city of Goma and are reportedly advancing south to take more territory.