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.
The health workers were killed when Mai-Mai fighters attacked a centre run by the United Nations health agency overnight in Biakato area of the Democratic Republic of Congo, local officials say.
UN mission MONUSCO spokesman said a "rapid intervention force" of peacekeepers was dispatched to the area in the morning.
Citizens of Beni and Butembo have lashed out at the perceived failures of the Congolese authorities and UN to quell a notorious armed group. The unrest is feared to impact the Ebola outbreak as WHO evacuates 49 Ebola staff out of Beni.
Residents reacted in anger after suspected rebels killed eight people in an overnight raid. Dozens of civilians have been killed in massacres since the Congolese army launched an offensive against rebels from the Allied Democratic Forces
The eastern DR Congo province of South Kivu has recorded its first confirmed cases of Ebola in the country's year-old epidemic, one of which was a fatality, said the provincial government.
Officials blame the ADF militia group for twin overnight attacks in North Kivu province of the Democratic Republic of Congo.
People in parts of the Democratic Republic of the Congo have linked the response to the Ebola outbreak with political disenfranchisement making it harder for foreign organisations to contain the outbreak.
The overnight attack blamed on rebels from the Allied Democratic Forces group comes as the deadly Ebola outbreak in the east surpasses 2,000 cases.
Police use force to break demonstrations in eastern Democratic Republic of Congo over electoral commission's decision to exclude cities of Beni, Butembo and their surrounding areas from voting in Sunday's presidential election.
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