Rwanda-backed rebels claimed they captured eastern Congo’s largest city, Goma, early Monday, as the United Nations described a mass panic among its 2 million people and Congo’s government said the rebel advance was a “declaration of war.

Gunfire rang out early on Monday across parts of Goma, the largest city in eastern Congo, hours after Rwanda-backed rebels said they had seized the city despite the United Nations Security Council's calling for an end to the offensive.

Rwanda-backed rebels have captured eastern Congo’s largest city, Goma, as the United Nations reported “mass panic” with the government dubbing the insurgency a “declaration of war.” The city’s capture came following a 48-hour deadline imposed by the M23 rebel group for the Congolese army to surrender their weapons.