Troops used heavy arms to attack the estimated 200 diehard fighters holed up in the hills after a military offensive forced them from their last stronghold last week.
The fresh assault came a day after the leader of the beleaguered rebels, M23 president Bertrand Bisimwa, called for a ceasefire.
"We order all the forces of the Congolese revolutionary army to immediately end hostilities with the armed forces of the Democratic Republic of Congo (FARDC)," Bisimwa said in a statement yesterday.
Bisimwa urged rebel chiefs to "ensure the strict observance of this order by elements under their command."
But today, the M23 said in a statement that troops had launched a new assault using "heavy arms."
The order was issued amid fierce fighting in the mountainous region bordering Uganda and Rwanda, where the army has pinned the rebels who fled to the hills after their base was seized Wednesday in the town of Bunagana, about 80 kilometres north of the regional capital Goma.
"We are pounding Mbuzi," one of three mountains in eastern DR Congo where the rebels are hiding, General Lucien Bahuma told AFP by telephone early yesterday. "After the artillery we will send in the troops."
A DR Congo captain, speaking anonymously, said the army was "claiming back the hills. There is shooting in the mountains of Ntamugenga, Mbuzi and Runyonyi. The rebels are fleeing."
The lush green hilly region has been rocked by heavy fighting for the past 10 days as FARDC troops battle to stamp out the insurgency once and for all in the restive, mineral-rich North Kivu province.
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