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.

Goma, Democratic Republic of the Congo - Residents and M23 supporters shout slogans as they celebrate the takeover of the city by M23 fighters at the governor's office compound in Goma, after the M23 (March 23 Movement) rebel group launched a large-scale offensive in eastern DRC.

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.

Members of the M23 rebel group gather to supervise Congolese potential recruits for the M23 rebel group before being taken to training centres run by M23 rebels, amid clashes between M23 rebels and the Armed Forces of the Democratic Republic of the Congo (FARDC),