Burundi is withdrawing its forces from eastern Congo where they had been fighting against M23 rebels, four sources said on Tuesday, in a further blow to the Democratic Republic of Congo army as it struggles to halt a rebel advance.

Rwandan-backed M23 rebels who in late January captured Goma, the biggest city in eastern Congo, have since been advancing around one of Africa's great lakes, Lake Kivu, towards the

Rwanda-backed rebels have reached the center of east Congo’s second-largest city, Bukavu, and taken control of the South Kivu province administrative office