At least 40 people were massacred by the Allied Democratic Forces (ADF) rebels on Saturday evening in North Kivu province in eastern Congo.
Military sources cited by Xinhua said the rebels had attacked several military camps in Beni, three of which were captured.
Survivors of the attacks on military camps told Xinhua the rebels had released randomly some people before they ruthlessly killed the other captives.
The situation remains tense at the moment, according to local military authorities.
The ADF is considered a terrorist group by the Ugandan government. It was originally based in west Uganda but has expanded into the neighbouring Congo.
The eastern region in Congo is beset by instability due to the presence of several home-grown and foreign armed rebel groups. UN data showed thousands of civilians have been killed in various armed conflicts in the region since 2016.
--IANS
ahm/vd
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