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.

Rwanda-backed rebels say they captured eastern Congo’s strategic city of Goma, the hub of a region containing trillions of dollars in mineral wealth that remains largely untapped.

Colleta Nzabonipa, 54, sits among other internally displaced people who fled from various camps following fighting between M23 rebels and the Armed Forces of the Democratic Republic of the Congo, in Goma,