New Mexico teen accused of killing parents, 3 siblings may have planned Walmart massacre, report says Bernalillo Sheriff's Deputies investigate at the scene of the multiple homicide at South Valley in Albuquerque, N.M., on Sunday Jan. 20, 2013. / AP Photo/The Albuquerque Journal, Adolphe Pierre-Louis (CBS/AP) ALBUQUERQUE, N.M. - Authorities believe a 15-year-old New Mexico teen accused of shooting his parents and three younger siblings to death over the weekend planned to drive to a nearby Walmart, kill more people there and eventually die in a shootout with police, the Albuquerque Journal reports. Nehemiah Griego packed loaded weapons, including an assault rifle, into the family car in preparation for the alleged attack, according to the newspaper. But before he could carry out his plan, the teen reportedly called and related his crime to a friend who convinced him to meet at Calvary Chapel. According to the Journal, Griego stayed at the church for hours before telling a security guard his family had been killed. The guard drove the teenager home and notified police upon seeing the crime scene. Investigators trying to piece together what led to the violence late Saturday night found several guns, including an AR-15 assault rifle and a .22 caliber pistol, Bernalillo County Sheriff Dan Houston said Sunday. The owner of the weapons has not been determined. Griego was arrested following the shootings at the residence in a rural area southwest of downtown Albuquerque, the sheriff's department said. He was charged with two counts of murder and three counts of child abuse resulting in death. Authorities identified the victims as Greg Griego, 51, his wife Sara Griego, 40, and three of their children: a 9-year-old boy, Zephania Griego, and daughters Jael Griego, 5, and Angelina Griego, 2. Nehemiah Griego had never been in trouble with the law, according to state officials. The state's child welfare agency has no record of any contacts with the 15-year-old or his family, spokesman Bob Tafoya said Monday. A records check by the Department of Children, Youth and Families also indicated the youth "had no involvement with the juvenile justice system whatsoever," Tafoya said. More on Crimesider January 21, 2013 - New Mexico teen accused of killing parents, 3 younger siblings