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 assault rifle, Bernalillo County Sheriff Dan Houston said Sunday. The owner of the weapons hasn't been determined.

"There's no other way to say it, except that we have a horrific crime scene down there that we are working on," said Houston.