BOISE - One person was in custody Wednesday and police were searching for other suspects after finding two men and a woman dead in a home in the Boise foothills.

"It's hard for me to fathom even after 31 years of law enforcement what could possibly motivate somebody to do to these people what they did," Ada County Sheriff Gary Raney said. "The person could still be on the loose."

Raney declined to speculate on a motive or say if anything was missing from the home. He said the victims were related, and the killings occurred sometime between Sunday evening and Tuesday morning.

Names weren't released and he declined to release many details about the ongoing investigation.

He said police were looking for suspects linked to a gold 2003 Subaru Legacy that was in the area when the killings occurred. He said the vehicle likely appeared in areas around Boise, and he asked that anyone who saw it to report it to police.

Police arrested someone Wednesday at an electronics store in Boise but Raney declined to say how the person might have been connected to the crime. The person has not been identified by police.

Raney called the killings "heinous."

"That's probably an understatement," he said.

The killings took place in what records say is a three-bedroom, three-bathroom home on 20 acres with a total value worth $800,000. Authorities say the property has horses and other buildings.

He said police responded after a family member called Tuesday.

"I've probably not seen a bloodier or more violent murder occur," said Raney.

He said other law enforcement agencies were investigating, including the U.S. Marshals Service.

Wallace man pleads guilty to hammer attacks

By Kit Pearson/Hagadone News Network

WALLACE - Andrew Franklin Carey, 33, pleaded guilty in court Monday to hitting two men in the head with hammers.

In First Judicial District Court, Carey admitted to two counts of aggravated battery and awaits sentencing May 4 at 9 a.m.

In both crimes, committed against different victims two months apart, Carey caused lacerations requiring stitches by hitting each man with a hammer.

Born in Washington and with a felony conviction in that state, Carey was living in Wallace when the two batteries occurred, according to court records.

During the first incident, Carey used a hammer to strike a man after an altercation in Wallace on April 9, 2014.

On June 15, 2014, Carey battered a Silverton resident at his home. Court records reflect that Carey knocked on the man's door, asked the man his name, and hit him with a hammer.

The second victim described Carey to police as standing 6-foot-5 and weighing 300 pounds.

In the second incident, four witnesses saw a man arrive to the area in a Toyota Camry with Washington license plates. Another witness recognized Carey, court records indicate.

Each count of aggravated battery carries a maximum sentence of 15 years in prison.