The Congolese army said it had recaptured two more towns and was heading for the rebel stronghold of Rutshuru in a third day of fighting on Sunday, raising the prospect of a military victory by government forces.
A Congolese army officer on the front line said it had taken the towns of Kiwanja and Kalingera from the M23 rebels on Sunday, a day after wresting the strategic town of Kibumba near the Rwandan border from the insurgents.
Fighting was continuing at Kiguri, 25 km (15 miles) north of Goma, the biggest city in eastern Congo, he said.
The army had also opened a second front to the north of M23 positions and was moving southward to Rutshuru, officers said.
"We are consolidating the zones we have conquered," army spokesman Colonel Olivier Hamuli told Reuters near the front line. "Very soon we will take Rutshuru. Those who disarm we will accept, the others we will pursue."