Official blames the latest attack on Ugandan rebels, but some experts say the Congolese army may have been involved.
Fears grow that recent violence could lead to armed conflict in the DRC, which is the world's largest coltan producer - a main mineral for mobile phone production.
The Human Rights Watch in Africa says at least 44 people were killed in protests against President Joseph Kabila, including 37 killed by security forces and six police officers killed by demonstrators.
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