The ADF, is considered the deadliest of scores of armed militias that roam the mineral-rich eastern DR Congo
Rebels shot or hacked to death at least 30 people in a new massacre in north-eastern DR Congo, local and UN sources said on Monday.
Members of civil society blamed the Allied Democratic Forces (ADF), a group linked to the so-called Islamic State, for the attack on Saturday in the province of Ituri.
Dieudonne Malangayi, acting chairman of the chiefdom of Walese Vonkutu, initially said 14 people died but told AFP that more bodies had been discovered in the bush and the toll could rise further.
"The civilians who went to look for the bodies of the victims found 16 others in the bush, which makes 30 civilians massacred," he said.
A UN source confirmed that at least 30 people had died in the attack. One civilian who helped look for bodies said the victims had mostly been attacked with machetes or shot.
Augustin Muhindo Musavuli, a village elder who took part in the search, said he had seen 17 dead, mostly hacked to death by machete, but also shot dead. Some had their throats slit, others were disembowelled.
The ADF, which the United States has deemed a terrorist group, is considered the deadliest of scores of armed militias that roam the mineral-rich eastern DR Congo.
Since May, the provinces of North Kivu and Ituri have been under a state of siege, with the army and police replacing civilian authorities as they fight armed groups.
Malangayi complained that the army took no action despite being alerted on Friday to rebel movements in the area.
The ADF first emerged as a rebel movement in neighbouring Uganda in 1996, but is today presented as the Islamic State's Central Africa Province.
It has been accused of killing thousands of civilians since 2013.
The bodies from Saturday's attack were transported to hospital morgues in the area, said Malangayi.
David Beyza Katabuka, head of the local Red Cross, said he could not send a team to bury the bodies. "We fear for our security and we don't have enough equipment to do the work," he said.