Standard UN peacekeeping procedure in the Congo normally involves sitting idle while massacres take place. But peacekeepers were actually in combat on Saturday. Were they engaged in some sort of peacekeeping operation? No, they were defending their base against an attack by "about 50 men armed with AK47 rifles and locally made weapons" from the "tribal Mai-Mai militia." The UN forces tried to avoid fighting, firing "repeated warning shots," but ended up having to kill eight of the attackers and wound two others.
The moral of this story is that if you are a member of some murderous gang in the Congo, stick to raping and massacring helpless civilians. That way the UN peacekeeping forces can sit tight in their bases, and find some excuse for not intervening. But if you actually attack their bases, even UN troops will fight back.