Rwanda-backed rebels have captured two major cities in Congo’s mineral-rich east after a major escalation in their yearslong fighting against Congolese forces.

BUKAVU, Congo — Rwanda-backed rebels tightened their grip on Bukavu on Monday, a day after seizing the second major city in eastern Congo whose residents appeared resigned to their fate under the new rulers.

Panic and looting are sweeping through eastern Congo’s second largest city as residents fled by the thousands to escape the looming advance of Rwanda-backed rebels.