DR Congo’s army has been fighting a militia group in the central Kasai region
The UN has said it has found 13 mass graves in the Democratic Republic of Congo’s central Kasai province since the beginning of March.
This brings the number discovered since last August to 23.
The UN has been unable to examine the mass graves and cannot say if they were recently dug.
It estimates that 400 people, including women and children, have been killed in clashes between the army and a rebel group.
The government is fighting to put down a rebellion by a group called Kamwina Nsapu, which began after a regional chief was killed.
Both sides have been accused of committing human rights violations.
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