At least 38 civilians, including women and children, were killed in attacks carried out by the Coopérative pour le développement du Congo (CODECO) at the Blakete-Plitu mine.
More civilians were displaced and reported missing when the attackers set fire to the nearby village of Malika, where they also reportedly raped six women.
The UN mission in the country, known by the French acronym MONUSCO, carried out a medical evacuation on Monday, transporting seriously injured civilians to medical facilities in the provincial capital, Bunia.
Allow UN access
The secretary-general expressed his deepest condolences to the families of the victims and wished the injured a speedy recovery, UN spokesman Stéphane Dujarric said in a statement.
“It calls on the Congolese authorities to investigate these incidents and bring those responsible to justice. The Secretary-General also urges the authorities to ensure MONUSCO’s immediate, free and unhindered access to areas of attack to facilitate efforts to protect civilians,” he said.
The UN chief has also called on all armed groups in the Democratic Republic of the Congo to stop their “cruel attacks” on civilians.
Combatants were also urged to participate unconditionally in the country’s political process and lay down their arms through the Disarmament, Demobilization, Community Recovery and Stabilization program.
Mr. Guterres underscored the UN’s continued support for the Congolese government and people in their efforts to achieve peace and stability.