Officials blame the ADF militia group for twin overnight attacks in North Kivu province of the Democratic Republic of Congo.
Restrictions on travelling to the Democratic Republic of Congo would "impede our ability to effectively control" Ebola virus, Dr John N Nkengasong, a top health officer at African Union said.
The Ebola outbreak in the eastern Democratic Republic of Congo has so far killed 1,655 people and 694 have been cured
Democratic Republic of Congo recorded 2,382 cases of Ebola, of which 1,606 were fatal, the Health Ministry says.
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.
Some 2,025 cases and 1,357 deaths recorded since the epidemic began in August in the Democratic Republic of the Congo's North Kivu and Ituri provinces, WHO officials say.
Democratic Republic of the Congo President Felix Tshisekedi declared mourning as 13 people are dead and 142 still missing from a passenger boat that sank on Lake Kivu.
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.
The killings blamed on suspected militants of Allied Democratic Forces occurred overnight in eastern Democratic Republic of Congo's Beni region, authorities and witnesses say.
DR Congo authorities have said 12 civilians died in Mangolikene on the outskirts of Beni city in North Kivu while another five were killed overnight in the Paida area.
Ebola WHO staff have been evacuated amid Democratic Republic of Congo clashes. Since August 1, the virus outbreak in Beni city, which is home to up to 300,000 people, has killed over 200 people.
With over 300 cases the epidemic also ranks as third worst in the history of the continent, following the 2013-2016 outbreak in West Africa where over 28,000 cases were confirmed and an outbreak in Uganda in 2000 involving 425 cases.
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