On the night of Dec. 29, members of an unidentified armed group crossed the Rusizi River from the Democratic Republic of Congo into Burundi. According to local residents, some 100 to 150 well-armed men slipped across the murky river into the hills. The morning after they crossed, the armed group fought with soldiers of the Burundian National Defence Force and police in the country’s westernmost province, Cibitoke. In the four or five days that followed, the fighters scattered and broke up into groups while being hunted by the army and the police. There were some clashes and the Burundian security forces said they killed at least 95 members of the group. Two Burundian soldiers and two civilians also died.