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.

The weeks-long march of the M23 armed group has prompted calls for crisis talks, as well as rising international criticism and warnings of a looming humanitarian crisis.

KINSHASA -- Tensions remained high in the Democratic Republic of the Congo (DRC) on Tuesday as the March 23 Movement (M23) rebellion advanced in the country's North Kivu and South Kivu provinces.

The weeks-long march of the M23 armed group, which has captured vast swathes of eastern DRC including most of the key city of Goma, has prompted calls for crisis talks and warnings of a looming humanitarian crisis.

DR Congo President Felix Tshisekedi insisted his troops were mounting a "vigorous" response to Rwanda-backed fighters advancing in the country's perennially troubled east and slammed the international

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

President of the Democratic Republic of Congo said on Thursday that his troopers are fighting an insurgence by the Rwandan-backed militant group M23 which recently captured swaths of land in the east.

Rwanda-backed rebels captured large parts of Goma, the biggest city in eastern Congo, including its airport, the United Nations said, as Rwanda's president on Wednesday joined calls for a ceasefire in the decadeslong conflict amid mounting international pressure.

By Yassin Kombi and David Lewis GOMA, Democratic Republic of Congo (Reuters) - Rwandan-backed M23 rebels in Democratic Republic of Congo were moving south on Wednesday towards Bukavu, the capital of South Kivu province,