ALBUQUERQUE, N.M. — A horrific scene awaited officers responding to an emergency call at a New Mexico home — five family members dead, all with multiple gunshot wounds. The victims were later identified as parents and their three young children and the suspected attacker as their 15-year-old son. Investigators trying to piece together what led to the violence late Saturday night found several guns believed used in the shootings, including one described by authorities as a semi-automatic assault-type rifle. The owner of the weapons hasn’t been determined. “There’s no other way to say it, except that we have a horrific …