In a statement, the country's army says it condemns "a series of mass murders of civilians" that it accuses both the Rwanda-backed rebel group M23 and the Rwandan military of being behind.
Earlier in August, the UN human rights chief Volker Türk said 319 people had been killed in the past month in various parts of the Kivu region, something he says is the highest figure since M23 re-emerged in its current form in 2022.
As recently as July, the Democratic Republic of the Congo signed a declaration of principle on a permanent ceasefire with the aim of signing a peace agreement by August 18 at the latest. The escalated violence may jeopardize the agreement.