Pocatello, Idaho » The driver of a bus that overturned while returning from an American Fork High School band competition in Idaho, and a student on that bus, remained hospitalized Sunday night.

They were among dozens taken Saturday to the Portneuf Medical Center in Pocatello, Idaho, following the Interstate 15 crash near McCammon, Idaho, about 143 miles north of Salt Lake City. Most were not seriously injured and only three, plus the driver, spent Saturday night at the hospital. Two students were released Sunday.

The crash claimed the life of American Fork High School woodwind instructor Heather Christensen, 33. Witnesses said she was attempting to save students by grabbing

the steering wheel after the bus driver, Debra Jarvis, 50, of Spanish Fork, blacked out.

Jarvis and the unnamed student who remained at the medical center Sunday were in stable condition. Authorities declined to speak specifically about their injuries.

Forty-six students and two chaperones were traveling on the bus that rolled. It was part of a four-bus caravan. There were 222 students on the band trip. The caravan was returning from winning a competition at Idaho State University in Pocatello.

Four students were trapped in the bus after it rolled and special rescue equipment was used to extricate two students whose limbs were pinned, police said. Both students are reportedly fine, they said.

Christensen

was partially ejected from the bus, said Idaho State Police Capt. Eric Dayley, region commander for southeast Idaho, at a Sunday afternoon news conference at the Idaho State patrol office. A tow truck had to be used to lift the bus to remove Christensen's body.

The bus is a 2005 Motor Coach owned by Lake Shore Motor Coach Lines, based in Provo and was chartered by the school. Company officials could not be reached for comment Sunday.

Jarvis is a Lake Shore employee, Dayley said. Investigators have no reason to believe she has a pre-existing medical condition that caused her to apparently black out, he said. A phone call to her room Sunday was answered by a man who told The Tribune that Jarvis declined to comment.

A blood sample was taken from Jarvis, but test results had not been received Sunday, said Idaho State Police Lt. Ismael Gonzales. Drawing blood from a driver in an accident is routine, he said. Jarvis is cooperating with the investigation, police said.

American Fork High Director of Bands John Miller said Jarvis expressed remorse after the accident. "She kept saying 'I'm sorry. I'm sorry,'" he said. The bus company was not negligent, he said, noting it sent extra buses to transport students to the hospital and home.

Investigators studied the crash scene Sunday, and two commercial-safety specialists are examining the bus for maintenance problems, Dayley said.

Luana Lish, a volunteer emergency responder with Inkom Fire Department, and Inkom Quick Response Unit called the accident scene "chaotic."

"It's miraculous that we had only one fatality and the rest walked away with minor injuries," she said.

She said the driver of the bus following the one that crashed went in it to help free students. He was so stressed by the situation, she said, that emergency medical personnel determined he was in no condition to drive his bus home.

American Fork junior Caleb Jones, who rode in the back of the bus that rolled, suffered only cuts and bruises. "I hit something and blacked out and then I opened my eyes and everything was spinning and everyone was flipping. Then I blacked out again and then opened my eyes and the bus had flipped over and everyone was screaming," he said.

Other than the three students who spent Saturday night at the Pocatello hospital, the rest returned to Utah early Sunday morning. Uninjured students returned to American Fork High about 1 a.m. About 30 students who had been examined for minor injuries and then were released returned to the school about 3:30 a.m. Sunday. They were greeted by a crowd of welcoming parents, family and community members.

Johnny Ketner, chief of Inkom Volunteer Fire Department in Inkom, Idaho said the scene of the accident Saturday night was unlike anything he has seen in his seven years as an emergency responder.

He rode the bus that transported the injured students to the hospital and called the mood "somber but positive."

"The students and the leaders helped the situation tremendously. They remained calm. They helped each other and we were able to manage the situation better," he said.

Eight emergency-response agencies responded to the accident.

Tribune reporter Lisa Schencker contributed to this report.