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.

Rebels seize Nyabibwe in South Kivu province, despite declaring ceasefire starting Tuesday due to humanitarian difficulties

The United Nations meanwhile said the battle for the key city of Goma, which the M23 and Rwandan troops seized last week, had left at least 2,900 people dead - far higher than the previous death toll of 900.