The violence occurred in northeastern Congo-Kinshasa earlier this week, sources told AFP.
Just days earlier, the Allied Democratic Forces (ADF) militant group had killed 66 people, including three health workers fighting the Ebola outbreak in the country.
Between Monday and Friday, the ADF also attacked several villages in the Mambasa area of Ituri, a province that has long been plagued by unrest and where the latest Ebola outbreak began six months ago.
The outbreak, which began in May, is the worst in the country's history. As of Tuesday, the total number of confirmed cases had reached 11,042, including 5,387 deaths, according to authorities.
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