VERSAILLES, France -- Six Russian immigrants were found shot dead Monday at a house in a Paris suburb, and authorities said a teenage son confessed to the killings. Those killed, according to police, were wood merchant Eugene Polevoi and his wife; the parents of Mrs. Polevoi; and another couple, who were friends of the family. Police were alerted before dawn by the Polevois' 16-year-old son, who confessed to the killings and was taken into custody. The youth's half-sister, 3, hidden under blankets, was found unharmed at the house, in Louveciennes, on the western outskirts of Paris.