Rebels backed by the Islamic State group killed at least 20 people in an attack over the weekend on a village in eastern Congo, the military said Monday. The attack by the Allied Democratic Forces, or ADF, took place early Saturday in the village of Mambimbi-Isigo in the Lubero territory of North Kivu province, military administrator Col. Alain Kiwewa Mitela told The Associated Press over the phone.

There was no immediate comment from the ADF. The attack has caused a mass displacement of residents, aggravating an already dire humanitarian situation, Mitela said. According to civil society activists in the area, the rebels first raided several farmers` fields before attacking civilians with knives and firearms. "This toll is still provisional because many civilians are missing," Kinos Kitwa, head of civil society in Bapere, said. He criticised the small number of Congolese army troops in the area.