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.

DR Congo requested the urgent meeting of the UN's top rights body to discuss escalating fighting by Rwanda-backed armed group M23 in North and South Kivu provinces, and drew up a draft resolution that would set up the probe.