ALBUQUERQUE, N.M. (AP) – Investigators are trying to determine who owned several guns, including a semi-automatic military-style rifle, that were found inside a Albuquerque, New Mexico, home where a teenage boy fatally shot two adults and three children last night.

The boy has been arrested and booked on murder and other charges.

Bernalillo County sheriff’s spokesman Aaron Williamson says the boy’s motive and connection to the five victims aren’t immediately known. Investigators also are trying to determine whether the victims were related.