At an M23 news conference in Goma on Thursday, Nangaa said the rebels aim to set up a new administration in the city of 2 million people that's now home to hundreds of thousands of displaced Congolese. The rebels spoke to reporters of their plans to return displaced people to their homes, presenting a major challenge to Tshisekedi.

Rwandan-backed M23 rebels in Democratic Republic of Congo are seeking to advance south towards Bukavu, the capital of South Kivu province, in an attempt to expand their area of control in the country's east after capturing the city of Goma.

STORY: Rwandan-backed rebels appear keen to show they can not only seize the biggest city in eastern Democratic Republic of Congo - but also govern it.That's a stark contrast to the last time M23 took Goma - back in 2012.