Militia members armed with machetes tried to burn down an Ebola treatment center in Katwa overnight, as stated by a Congolese official on Saturday and reported by the Associated Press.

The big picture: This was the first militia attack against the Katwa center, per the AP. Hours earlier, a doctor was killed and 2 hospital workers were injured in an attack on the other primary Ebola treatment center in Butembo. A police officer was killed at the Butembo center during a similar attack in March. These ongoing attacks, part of widespread civil unrest and community resistance to treatment, are occurring in the midst of the second-largest Ebola outbreak on record, with more than 1,000 cases of the hemorrhagic fever so far.

A doctor was killed and 2 hospital workers were injured on Friday during an attack on a hospital in the Democratic Republic of the Congo while they were working with Ebola virus victims, the World Health Organization announced.

The backdrop: This is not the first attack on a hospital that is treating Ebola victims during the second-largest Ebola virus outbreak on record. WHO has yet to declare its highest alert: "Public Health Emergency of International Concern," despite at least 1,000 cases of Ebola confirmed in the Congo.

Go deeper: WHO stops short of declaring health emergency over DRC Ebola outbreak