Nearly three thousand people have been killed in the city of Goma in the eastern Democratic Republic of Congo, according to the United Nations, after the provincial capital was captured by rebels following days of fierce fighting with the Congolese army.

The Rwanda-backed rebels who captured a major city in eastern Congo have sought to reassure its residents about their safety.

Rwandan-backed M23 said Thursday it wanted to "liberate all of the Congo" in its first public meeting since seizing the eastern city of Goma after deadly clashes, as its fighters advanced towards another regional capital.

A rebel group that claimed to have captured the city of Goma in the eastern Democratic Republic of Congo last week has called for an immediate humanitarian ceasefire, after fighting with the Congolese military has left hundreds of people dead.