After Rwanda-backed M23 rebels took control of the biggest city in eastern Congo this week, the man who emerged from the shadows to assert his leadership was not the group's long-time military leader.

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.

Congolese troops have fought back against Rwanda-backed rebels who the U.N. says are moving fast into the South Kivu province after seizing the region’s largest city and an international airport