Rwandan President Paul Kagame has told CNN he doesn’t know if his country’s troops are in the east of the Democratic Republic of Congo (DRC), where fighting between the M23 armed group and Congolese soldiers has killed more than 700 people and injured thousands in recent days.

The M23 and Rwandan forces on Wednesday launched a new offensive in eastern Democratic Republic of Congo, seizing a mining town in South Kivu province, as they resumed their advance

To better understand the three-year insurgency, have a look at some of our strongest reporting.

The city of 2 million people is at the heart of a region home to trillions of dollars in mineral wealth and remains in rebel control.