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What is happening in eastern Congo, where rebels claim they captured a key city?

CAPTION CORRECTS YEAR A UN armoured personnel carrier burns during clashes with M23 rebels outside Goma, Democratic Republic of the Congo, Saturday, Jan. 25, 2025. (AP Photo/Moses Sawasawa)

Smoke rises from the French embassy in Kinshasa, Democratic Republic of the Congo Tuesday, Jan. 28, 2025, after it was attacked when people protested against the Rwanda-backed M23 rebels' advances into eastern Congos capital Goma. (AP Photo/Samy Ntumba Shambuyi)

People who crossed from Congo wait for assistance in Gyseny, Rwanda, Tuesday, Jan. 28, 2025, following M23 rebels' advances into eastern Congo's capital Goma. (AP Photo/Yuhi Irakiza)

People protest in Kinshasa, Democratic Republic of the Congo Tuesday, Jan. 28, 2025, against the Rwanda-backed M23 rebels' advances into eastern Congos capital Goma.(AP Photo/Samy Ntumba Shambuyi)

A person wounded in the fighting between M23 rebels and Congolese armed forces arrives at the Cbeca Ndosho hospital in Goma, Democratic Republic of the Congo, Thursday, Jan. 23, 2025. (AP Photo/Moses Sawasawa)

Rwanda security officials check people crossing from Congo in Gyseny, Rwanda, Tuesday, Jan. 28, 2025, following M23 rebels' advances into eastern Congo's capital Goma. (AP Photo/Yuhi Irakiza)