The march by Rwanda-backed rebels across eastern Congo risks escalating into a regional conflict, with countries such as Burundi, Uganda, and Tanzania already involved. Despite diplomatic efforts, tensions remain high.

Officials and residents say Rwanda-backed rebels have gained ground in eastern Congo despite the unilateral ceasefire they declared earlier this week, taking control of a town 100 kilometers (60 miles) from the provincial capital of Bukavu.

Rwanda said on Friday it had proof of an intended major attack by the Democratic Republic of Congo and denied it was fomenting conflict inside its neighbour's border.