Democratic Republic of Congo has approved four more experimental treatments against the deadly Ebola virus, the health ministry said as it raced to contain an outbreak in its violence-torn east.

Health authorities last week started administering the U.S.-developed mAb114 treatment to Ebola patients, the first time such a treatment had been used against an active outbreak.

The health ministry said in a daily bulletin late on Tuesday that the 10 patients who received mAb114 since Aug. 11 have experienced a "positive evolution," but the outbreak has continued to grow.