Police in Albuquerque, New Mexico, say a 15-year-old boy who reportedly gunned down his family had plans to end his spree "at a Wal-Mart, with mass destruction."

Nehemiah Griego will stand trial as an adult and is being charged with murder and child abuse resulting in death.

He was "frustrated with his mother," he told investigators, before allegedly using two guns, including a semi-automatic rifle, to kill his parents and little brothers and sisters.

Their bodies, with multiple gunshot wounds, were found in the family's home Saturday.

The victims have been identified as Greg Griego, who was the former pastor at an Albuquerque church, his wife Sarah, their 9-year-old son, and two daughters ages 5 and 2.

The teen’s parents reportedly owned the guns and police say they also found other weapons in the home.

Neighbors say the boy was quiet and liked to wear camouflage.

Evening Express will have the latest developments on this story from 5 p.m. to 7 p.m. ET on HLN.