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Fighting in eastern DR Congo has been concentrated in the provinces of North Kivu and South Kivu, home to many Chinese-run gold mines.

Based in South Kivu, it is mainly made up of Tutsis - and has attacked Burundi in the past.

That being said, experts and organisations like the UN have documented decades of discrimination against Congolese Tutsis and the Banyamulenge - a Tutsi sub-group concentrated in the South Kivu province.

Their first major coup was at the end of January with the taking of Goma – a city in the North Kivu province that is home to more than a million people.

The city of around two million people on the southern tip of Lake Kivu borders Rwanda and is an important transit point for the local mineral trade.