As Rwanda-backed M23 rebels in eastern Democratic Republic of Congo push south towards the city of Bukavu, they are likely to have to fight their way through thousands of troops from Burundi, ramping up the risk of a return to full-blown regional war.

Rwanda-backed rebels who have captured eastern Congo’s largest city say they plan to take their rebellion to the capital and seek to gain political power.

Rwanda-backed M23 rebels have expanded their presence in eastern Congo, capturing Goma, the region's major city. The UN expressed concerns over recent executions by the rebels following their intensified rebellion.