Authorities found four people dead in an abandoned truck in a corn field in western Wisconsin.
The victims were shot and were all from Minnesota.
The case has been described as a mystery.
Preliminary results of autopsies conducted Monday by the Ramsey County Medical Examiner's Office showed the two men and two women died of gunshot wounds, the Dunn County Sheriff's Office said Tuesday.
As reported by The Associated Press news agency, the victims were identified as Matthew Isiah Pettus, 26, Loyace Foremann III, 35, and Jasmine Christine Sturm, 30, all from St. Paul;
as well as Nitosha Lee Flug-Presley, 30, of Stillwater.
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Dunn County Sheriff Kevin Bygd said during a news conference Tuesday that authorities do not believe the person or persons responsible for the killings are local or in the area.
He said investigators have not identified a motive.
"That is a mystery," he assured.
Authorities believe the four Twin Cities area residents died within 24 hours from the time they were found and that the location "was a site where these victims were randomly taken," Bygd added.
"Everyone is a suspect at the moment," he
added.
"We are looking for everyone and all possibilities."
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Plug-Presley's father, Damone Presley Sr., told the local St. Paul Pioneer Press that the four victims were in a St. Paul bar Saturday night and that they got into someone's vehicle when they left the scene. .
"Why would this happen?"
A 911 call alerted deputies Sunday to the black truck that was off a rural highway in the town of Sheridan, according to the Dunn County Sheriff's Office.
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Officials previously claimed that there may have been a second dark-colored vehicle traveling with the car that was abandoned.
The Wisconsin Division of Criminal Investigation and the Wisconsin State Patrol are assisting in the investigation.