'Horrific' New Mexico shooting leaves 5 dead; investigators arrest 15-year-old From Meridith Edwards and Rick Martin, CNN January 20, 2013 -- Updated 2250 GMT (0650 HKT) NEW: "It was a very gruesome scene," one investigator says NEW: The 15-year-old suspect may be a family member, sheriff says The teen faces two counts of murder and three of child abuse resulting in death (CNN) -- Sheriff's investigators combed through what one called a "horrific" crime scene Sunday after the shooting deaths of five people, three of them children, outside Albuquerque, New Mexico. Each of victims had been shot multiple times, Bernalillo County sheriff's Lt. Sid Covington, and one of the weapons used was what he described as an assault rifle. Bernalillo County Sheriff Dan Houston said a 15-year-old boy, who "may be a family member," has been charged with two counts of murder and three counts of child abuse resulting in death. "Initially responding deputies entered the home and found the five deceased inside the residence, so obviously it was a very gruesome scene," Covington told reporters. There was no indication of a motive so far, he said. "I've never seen a scene quite like this," he added. Investigators did not released the names of the victims Sunday afternoon, saying the process of formally identifying the remains was still going on. But they said the dead included a man, a woman and three grade-school-age children -- two girls and a boy. Houston said deputies were dispatched to the home, in a semi-rural area on the southwestern edge of Albuquerque, around 9:15 p.m. They were summoned by "a party that was called by the suspect," he said, but "I don't know what the dynamics of that relationship is." He said investigators are unaware of any criminal history by teen and were looking into whether any family members had a record. The boy is being charged as a juvenile, but prosecutors could bring charges against him as an adult, Covington said. January 18, 2013 -- Updated 2047 GMT (0447 HKT) January 18, 2013 -- Updated 1843 GMT (0243 HKT)