Local sources have blamed the attack on militants affiliated with the Islamic State group.
The attack, attributed to the Allied Democratic Forces, ADF militant group by area residents, took place in the Beni territory in the troubled North Kivu province.
The mayor of the commune of Oicha, the capital of the Beni territory, Nicolas Kikuku confirmed that twenty deaths had been recorded.
The ADF, originally made up of mainly Muslim Ugandan rebels, has established a presence over the past three decades in eastern Democratic Republic of Congo, killing thousands of civilians.
The ADF has been accused of massacring Congolese civilians as well as staging attacks in neighbouring Uganda.
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