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.

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Thirty years after the violence, a related border conflict escalates, with control of mineral wealth at stake.

Congolese troops have fought back against Rwanda-backed rebels who the U.N. says are moving fast into the South Kivu province after seizing the region’s largest city and an international airport

Rebels in eastern Congo's largest city, Goma, began a ceasefire on Tuesday and people rushed to bury some 2,000 victims of last week's battles for the city as they feared the spread of disease. The Rwanda-backed M23 rebels who captured Goma declared a ceasefire on Monday and largely upheld it,