Pope Leo XIV mourned those killed in the violent attack on a Catholic Church in the Congo on Sunday by ISIS-backed rebels. The pontiff expressed sympathy and regret over the murders and wished for peace in the region.

A rebel group tied to the Islamic State claimed responsibility Monday for the massacre of dozens of Catholic worshippers in the Congo, according to Reuters. The rebel group, identified as the Allied Democratic Forces (ADF),

ISIS has claimed responsibility for a horror attack on worshippers at a Catholic church on Sunday. The attack left at least 43 people dead, including 19 women, 15 men and nine children.