A Congolese army spokesman reported, bringing the total death count in the region to over 80 since 4 June.
The region, plagued by armed violence for decades, has nearly 7 million displaced people.
The Allied Democratic Forces, now aligned with the so-called Islamic State group, have intensified their attacks, further destabilising the area. Recent assaults include a deadly attack in Masawu that killed 17 and additional bodies found in nearby villages.