Members of the Ranvir Sena, a private army of landlords, shot dead five people in Bariari village in Arwal district of Bihar on Saturday, Superintendent of Police P P Pandey said.
Two persons were critically injured in the attack, which took place because of an old enmity, he said, adding they were admitted to the Patna Medical College Hospital.
Military Police and Special Task Force personnel were looking for the killers, he added.