Fighters from the Allied Democratic Forces (ADF) group, which was driven out of Uganda in the late 1990s, attacked Samboko village, about 100km (60 miles) southwest of the city of Bunia, Omar Kavota from rights group CEPADHO said on Wednesday.
A day after killing at least 17 in the nearby village of Makutano, ADF members killed at least 40 people with machetes and looted food and valuables early on Tuesday, Kavota added
On the ground, some people have fled and others have given themselves the courage to stay for the moment.
More than 400 people have been killed in attacks attributed to the ADF since the army began an offensive to oust the group from its bases last year, according to the Kivu Security Tracker (KST), a research initiative that maps unrest in the region.
About 200,000 people have fled their homes in Ituri province, where the two villages are located, in the past two months because of the widespread violence by a variety of armed groups.
Last month, 22 people from the Hema community were killed in attacks in the village of Koli in Ituri province, which were blamed on the Cooperative for the Development of Congo – an armed political-religious sect drawn from the Lendu ethnic group.