Women and children among those murdered in two separate attacks in restive Ituri and North Kivu provinces of Democratic Republic of Congo, officials say.
A senior regional official in the eastern Ituri province said "attackers armed with guns and knives killed 21 civilians in Mahagi," which was the deadliest attack in three days.
The Democratic Republic of Congo was two days away from declaring the end of the world's second-largest Ebola epidemic when a new chain of infection was discovered on April 10, following more than seven weeks without a new case.
Ebola was on the brink of being declared over, but new cases have propped up alongside the emergence of the coronavirus.
The new Ebola case prevented the Democratic Republic of Congo from declaring the end of the second-deadliest outbreak of the virus.
The Central African country planned to declare an end to the epidemic but a 26-year-old man died in hospital in the area of Beni on Thursday morning.
Spokesman for Democratic Republic of the Congo's army said soldiers and rebels clashed in the Beni province of North Kivu bordering Uganda in the east on Friday.
Officials of restive Beni region in Democratic Republic of Congo blame ADF fighters for massacre in Alungupa village in "surprise" attack.
At least 62 civilians killed in a series of attacks by ADF militants this week in eastern Democratic Republic of Congo, officials say, while an NGO says seven people were killed by Mai-Mai militia in volatile Beni region.
Allied Democratic Forces, a militia originally from neighbouring Uganda, has killed more than 200 people since the army launched an offensive against the militia on October 30, according to a toll compiled by civil society groups.
The Congolese rights group said that rebels from the Allied Democratic Forces had killed at least 43 people since Friday in and around Beni, the epicentre of the ongoing Ebola epidemic.
The victims were hacked to death by a notorious militia group with machetes in Oicha, about 30 kilometres from the city of Beni, a local official said.
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