Police said a New Mexico teenager likely used an AR-15 semi-automatic rifle in the shooting of his family on Saturday, KOB.com reports. Multiple weapons were found at the scene.
The alleged shooter, 15-year old Nehemiah Griego, has been charged with two counts of murder for the two adults and three counts of child abuse resulting in death.
Correction: This post has been updated to correct the type of gun allegedly used in the killing.