“Right now, there’s no known cause of death,” Springville Police Lt. Dave Caron said at a news conference Saturday night. “There’s nothing obvious.”

Preliminary autopsies later found that the five victims hadn’t been shot or stabbed, and there were no noticeable traumatic injuries on the bodies, the Associated Press reported.

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“Preliminary autopsy results for the family of five who were found dead in their home have ruled out any sort of violent assault,” Springville police told the Deseret News in a prepared statement. “The next step is to continue the investigation through analysis of blood samples to determine what may have caused the deaths.”

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The newspaper reported that the couple’s oldest son and another relative discovered the bodies Saturday evening. According to the News:

The son went to his grandparents’ house, who live nearby, to say he didn’t know where the family was. That’s when the grandmother and the son went back to the house and found all five bodies in the parents’ bedroom, said Springville Police Lt. Dave Caron.

Springville Police Chief J. Scott Finlayson told the paper that authorities didn’t find unsafe levels when they tested for carbon monoxide in the house, and a kitten found in another room wasn’t hurt. Doors to the home had been opened by the time tests were conducted, however.

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The family’s home was a duplex, and the News reported that authorities also checked for carbon monoxide on the other portion of the property. It was determined to be safe as well.

“I just couldn’t believe it. I mean, he’s my best friend,” Reilly Strecker, a resident of the duplex and a friend of one of the Strack children, told the paper. “They’re really good people. His dad was so nice. Their mom was nice. They were just fun to be around.”