Minnesota teenager stabbed to death while tubing down river

SOMERSET, Wis. (AP) — A Minnesota teenager died and four other people were seriously hurt after being stabbed while tubing down a Wisconsin river, authorities said.

St. Croix County Sheriff Scott Knudson the victims and suspect, a 52-year-old Prior Lake, Minnesota man, were all on the Apple River when the attack happened Saturday afternoon.

Knudson said investigators were working to determine what led to the stabbings and whether the victims and suspect knew each other. They were tubing with two different groups that included about 20 people.

The knife attack happened on a difficult-to-access section of the river near the town of Somerset, Wisconsin, which is about 35 miles east of Minneapolis.

A 17-year-old boy from Stillwater, Minnesota, died. Two of the other victims were flown to a hospital in St. Paul, Minnesota, and two others were taken there by ambulance.