This is stated by humanitarian and security sources to AFP.
M23, which has its roots in neighboring Rwanda, declared a unilateral ceasefire on Monday, which apparently has now been broken. The rebels are said to have taken the mining town of Nyabibwe, located ten miles from the provincial capital of Bukavu in South Kivu, with the support of Rwandan forces.
This is proof that the unilateral ceasefire declared was just a trick, says Patrick Muyaya, spokesperson for the Congolese government.
Several ceasefires between the rebel movement and the Congolese army have been declared in recent years, only to be systematically broken later.
Last week's capture of Goma was a significant escalation in the mineral-rich region, which has been plagued by conflict involving dozens of armed groups for three decades.
The presidents of the Democratic Republic of Congo and Rwanda, Felix Tshisekedi and Paul Kagame, are scheduled to meet on Saturday at a regional summit in Tanzania. A day earlier, the UN Human Rights Council will meet at the request of the Democratic Republic of Congo to discuss the ongoing conflict.