Rwanda-backed M23 rebels move south, while Congolese volunteers unite to fight back.

• M23, backed by Rwanda, moves south to defend a key military airport in DR Congo.

• The group captured Goma, the capital of North Kivu province, earlier this week.

• The offensive has escalated in a region with dozens of armed groups claiming the lives of an estimated six million people over three decades.

• Rwanda aims to eradicate fighters linked to the 1994 genocide, accusing the country of profiting from the region’s reserves of minerals used in global electronics.

• The crisis has sparked an emergency summit in Zimbabwe’s Harare.

• UN warns of “credible reports that the M23 is moving rapidly towards the city of Bukavu”.