BUKAVU: Rwanda-backed rebels have occupied a second major city in mineral-rich eastern Congo, the government said Sunday, as M23 rebels confirmed they were in the city to restore order after it was abandoned by Congolese forces. The Congo River Alliance, a coalition of rebel groups that includes the M23, said in a statement that its fighters “decided to assist the population of Bukavu” in addressing its security challenges under the “old regime” in the city of 1.3 million people.