One man is in custody and more arrests are likely in a 2013 triple slaying at a dog-fighting and marijuana operation in rural Idaho, authorities say.

"It's an active investigation," Oneida County Sheriff Jeff Semrad told the Idaho State Journal in a story Friday (http://bit.ly/1F61Zsz). "We feel really good about this. We're really excited it has come this far."

Severo Luera, 35, of Tremonton, Utah, was served a felony warrant in the case Jan. 30 at the Box Elder County Jail in Utah, where he was already incarcerated on drug charges. He remains jailed.

The bodies of 62-year-old Brent L. Christensen, his 32-year-old son Trent Jon Christensen, and Trent's 27-year-old girlfriend Yavette Chivon Carter were discovered in April 2013 at a property outside Holbrook.

Carter and Trent Christensen had two daughters, a 2-year-old and an infant, who were found in the home unharmed. They were placed with family.

Authorities have not said what led them to arrest Luera or offered a possible motive. Luera is being held without bail, and Idaho authorities are working to have him extradited to the state.

Luera couldn't be reached Friday, and it wasn't clear if he had an attorney.

Cash and 38 marijuana plants valued at $95,000 were in the house where the killings took place. More than 60 pit bulls were at the property, some of them being boarded by Brent Christensen for other people, police have said.

The Idaho Humane Society removed the 63 dogs that officials said were in in poor condition, with most being underweight and malnourished. Many had lacerations and scars, and others had skin, eye and ear ailments and broken bones that went untreated. Some of the dogs had to be euthanized.

The killings occurred in Oneida County, but officials in Bannock County have been helping with the investigation.

"I think it's pretty clear there will be more arrests coming," Bannock County Sheriff Lorin Nielsen said.

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Information from: Idaho State Journal, http://www.journalnet.com