RICHFIELD, Idaho - At least 12 students suffered injuries, some of them serious, in a school bus crash on U.S. 26 west of Richfield Tuesday afternoon.

According to the Idaho State Police, the school bus rolled on the highway near the Dietrich cutoff.

ISP, the Lincoln County Sheriff's Office and Shoshone police investigated the crash at about 12:30 p.m. near milepost 175 in Lincoln County.

Police said the driver of the bus - 67-year-old Richard Mecham of Carey - was westbound on the highway when he drove off the right shoulder, over-corrected and rolled the bus.

The bus had 39 students with adult chaperones on board.

ISP said 12 students were transported to nearby hospitals by ambulance: seven by ground, five by air.

The Blaine County School District said the students on the bus were from Carey Junior High School.

A spokesperson for St. Luke's Magic Valley in Twin Falls said the hospital received 12 patients from the crash, including two who were brought in by air ambulance. Two of those patients were in fair condition Tuesday evening, four were listed as undetermined and six had been discharged.

The school district said students were also taken to St. Luke's Wood River Medical Center in Ketchum, as well as hospitals in Jerome, Gooding, and Pocatello.

None of the injuries are believed to be life-threatening.

ISP said Mecham wasn't injured, and that the chaperones were treated and released at the scene.

At least 14 students were uninjured and have been released to their parents.

A parent of a student who was on the bus told the Associated Press that her daughter remembers coaches yelling to get the driver's attention just before the bus flipped over.

Cindy Stocking of Carey said students heard coaches scream "hey, hey, hey!"

Stocking said her daughter is fine, but she decided to take her to the hospital emergency room anyway just to get checked out by a doctor.

School officials said the bus was transporting students to a track meet in Gooding at the time of the crash. The bus was also carrying two coaches.

"When you hear 'bus rollover,' the first thing you worry about is the safety of your students," said BCSD superintendent GwenCarol Holmes. "But we have very good emergency procedures in our district, and we practice them regularly, and everybody just kicked in and knew exactly what to do."

The cause of the crash is under investigation. It happened on an open stretch of rural road where the speed limit is 65 miles per hour.

Both lanes of the highway were closed for a couple hours after the crash. The highway is now open.

This is a developing story. Check back for updates.