Democratic Republic of Congo military officials and the rights group say CODECO, one of many militias operating in Congo's conflict-ridden east, is responsible for the attack.
"We have been alerted that CODECO militiamen killed people again in the Bahema-Nord chiefdom. Our forces are on the ground pursuing the enemy," said Jules Ngongo, Congolese army spokesman for Ituri province. He did not give a death toll.
The provisional toll is 12 dead and two injured, said Dieudonne Lossa, president of the Ituri province civil society chapter, which monitors killings, provided a provision death toll of 12, with two others injured.
In the worst attack so far this year, CODECO killed around 60 people at a displaced persons camp in February
Congo's government declared martial law in Ituri and neighboring North Kivu province more than a year ago in an effort to quell the violence, but deadly raids have surged since then.
