ASSOCIATED PRESS
SOMERSET — A Minnesota teenager has died and four others have been seriously injured after being stabbed while descending a river in western Wisconsin, authorities said.
St. Croix County Sheriff Scott Knudson, the victims and the suspect, a 52-year-old man from Prior Lake, Minn., were all on the Apple River when the attack happened on Saturday afternoon . Knudson said investigators are working to determine what led to the stabbings and whether the victims and suspect knew each other. They were tubing with two different groups which included about 20 people.

Water reclamation authorities are combing the Apple River with metal detectors after five people were stabbed while descending the river in Somerset on Saturday.
ALEX KORMANN, STAR TRIBUNE VIA AP
“We don’t yet know who was connected to whom, who knew each other or what precipitated it,” Knudson said.
The knife attack happened on a hard-to-reach section of the river near the town of Somerset, about 35 miles east of Minneapolis. The suspect was arrested about an hour and a half later while descending the river downstream.
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“Thank goodness a witness had taken a picture of him,” Knudson said. Told the Minneapolis Star Tribune. “Another witness located him outside the tubing area, where he was taken into custody.”
A 17-year-old boy from Stillwater, Minnesota has died. Two of the other victims were airlifted to a hospital in St. Paul, Minnesota, and two others were taken there by ambulance. The sheriff’s office said sunday that the condition of the four surviving victims – a woman and three men in their twenties – ranged from serious to critical. They were stabbed in the chest and torso.
The sheriff’s office did not name the victims, but provided some details about them. The victims included a 20-year-old man and a 22-year-old man from Luck; a 22-year-old man from Elk River, Minnesota; and a 24-year-old woman from Burnsville, Minnesota;
The suspect’s name was not immediately released, but St. Croix County Jail records show a 52-year-old man was being held without bond on suspicion of first-degree homicide, on four counts of assault. and wounds and four counts of mutilation.
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