Democratic Republic of Congo President Felix Tshisekedi has vowed “a vigorous and coordinated response” against a rebel alliance that has besieged swaths of the nation’s mineral-rich east and forced hundreds of local troops and foreign mercenaries to surrender.

Congolese President Félix Tshisekedi has vowed to restore government authority in the east, where Rwanda-backed M23 rebels have seized much of the city of Goma and are reportedly advancing south to seize more territory.

Rwanda-backed rebels who captured eastern Democratic Republic of Congo’s largest city said on Thursday they want to take their fight to the far-off capital, Kinshasa, while Congo’s president called for a massive military mobilisation to resist the rebellion and his defence minister rejected calls for talks.