Police who were alerted by a passenger's cell phone call intercepted a passenger bus and arrested an 18-year-old woman who had been holding the driver at knifepoint, authorities said.

The woman was disarmed by the driver and two passengers before the State Patrol and other officers stopped the bus in southwestern Minnesota. The three were taken to a Sioux Falls, S.D., hospital for treatment of knife cuts, authorities said.

The woman was identified by police as Jewel Anna (search), of Pennsylvania. She was taken to a hospital, according to the Rock County Sheriff's Department. The department, however, did not say whether she was injured.

The incident was reported Thursday afternoon about an hour after the Jefferson Lines bus was traveling from the Twin Cities to Sioux Falls (search). Officers caught up with the bus on Interstate 90 about one mile from the South Dakota border.

Jefferson Lines spokeswoman Bonnie Buchanan said a passenger had called the State Patrol.

"The passenger didn't want to put the phone up to his ear to listen, so he held the phone on the floor, and had it on and the Patrol could hear what was going on," Buchanan said.