DR Congo: heaviest fighting in a decade breaks out as rivals seek control of minerals

Long-simmering ethnic tensions in the eastern Democratic Republic of Congo—fed at times by its neighbors—have erupted into the most intense clashes in a decade as warring militias fight for control of the region and its mineral riches.

In recent days, the M23 rebel group has advanced to within 12 miles of the city of Goma, pushing United Nations-backed C…