Rwanda-backed rebels were quickly expanding their presence in eastern Congo after capturing Goma, the region's major city, the U.N. said Friday, also expressing concerns over executions it learned were carried out by the rebels following a major escalation of their yearslong rebellion.

Rwanda-backed M23 rebels are moving “rapidly” through South Kivu province toward the city of Bukavu in eastern Democratic Republic of Congo, the United Nations said.

M23 rebels on patrol in Goma, eastern Congo, which has reserves of minerals that are needed by the world’s electronics giants © AFP/ Rwanda’s stealth occupation of eastern Congo on x (opens in a new w