Rwandan-backed M23 rebels have seized control of a mining town in eastern Democratic Republic of Congo's South Kivu province, eight sources said on Wednesday, in an apparent violation of a unilateral ceasefire they declared this week.

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.

The fragile ceasefire in eastern DR Congo is on the verge of collapse as Rwandan-backed M23 rebels reportedly seize control of Nyabibwe town in South Kivu province. The mining town, a key commercial hub between Goma and Bukavu,

The M23 and Rwandan forces on Wednesday launched a new offensive in eastern Democratic Republic of Congo, seizing a mining town in South Kivu province, as they resumed their advance towards the regional capital Bukavu.