The teenager was arrested on murder and other charges in connection with the shootings Saturday night at the home in a rural area 10 miles southwest of downtown Albuquerque, Bernalillo County sheriff's spokesman Aaron Williamson said.
The victims' identities haven't been released, and the boy's motive and connection to the five victims weren't immediately known. Williamson said investigators were trying to determine if the victims were related.
"We are trying to identify the victims," Williamson said.
Each victim suffered more than one gunshot wound, he said.
Investigators also were trying to determine who owned several guns that were found at the home, one of which was a semi-automatic military-style rifle.
Authorities declined to release details of any conversation that the 15-year-old had with investigators.
The teenager was booked on two counts of murder and three counts of child abuse resulting in death.
On Sunday, a police roadblock cut off public access to the narrow dirt road that leads to the home.
Detectives were still processing the crime scene Sunday afternoon.
Peter Gomez, a 54-year-old carpenter who lives about 200 yards from the home, said he saw police vehicles and ambulances arrive Saturday night.
Gomez said he doesn't know the family that lives at the house, but he has seen a married couple and their two boys and two girls from time to time.
"It's a horrible thing," Gomez said. "You see all this stuff that happens all over the country, the shootings in the schools and theaters, and then it happens right here. It's sad."
More Nation & World Headlines
Nuclear smugglers sought terrorist buyers 6:26 p.m. Two win Nobel Prize for missing piece in neutrino mass puzzle U.S. strike on hospital was mistake, top general in Afghanistan says US to release 6,000 prisoners as part of sentencing-reform campaign Ex-UN General Assembly head among 6 held in bribery scheme American heating bills set to be lowest in at least four winters Clinton ad seizes on Rep. McCarthy’s Benghazi comments After weeks of unrest, Palestinian leader appeals for calm
Our new comment system is not supported in IE 7. Please upgrade your browser here.