Update, Thursday 3pm: Scotch College principal John Newton says five students involved in a bus accident near Nelson on Wednesday afternoon remain in a stable condition.
Mr Newton said all staff and students involved in the accident had been medically assessed.
"All but five have been discharged from hospital in both Mount Gambier and Adelaide," he said in a statement released on Thursday afternoon.
"Those remaining in hospital are in stable condition and their families are now with them as they receive ongoing support and medical care for non-life threatening injuries," he said.
"I also want to acknowledge the excellent support that everyone has received from first responders, the hospital staff in Mount Gambier and Adelaide and members of the Scotch community. They were sensitive, effective and incredibly professional in their response. As a community we are grateful for their support as well as for the many messages of concern received from around the state, country and even internationally."
Mr Newton said two senior staff members travelled to the rowing camp to provide additional support.
"After consulting with them, the college executive team, students and parents at the camp, and the college wellbeing team, it has been determined that our 34 intermediate rowers will be returning to Adelaide today and we have been in touch with their families," he said.
"The 22 senior rowers have elected to continue the camp program and will return to Adelaide this weekend as planned.
"The college is working closely with all agencies involved to enable immediate and ongoing support. All of our staff are also back on campus from today and we will be looking to them to help our community get through this very difficult time."
Earlier: More than 20 high school rowers were on board a school mini bus that crashed and rolled in Nelson on Wednesday.
Eight of those teenagers were taken to hospital after emergency services were called to the scene about 4.30pm.
It is believed the bus lost control and rolled onto its roof on Portland-Nelson Road near Black Swan Road.
An Ambulance Victoria spokeswoman said two teenagers, one with back and chest injuries and one with lower body injuries, were airlifted to Adelaide's Women's and Children's Hospital in a stable condition.
A further two passengers were taken with back injuries, one with neck injuries and one with minor injuries by road ambulance to Mount Gambier Hospital in a stable condition.
She said another teenager suffered back and chest injuries, and one with lower body injuries, were airlifted to a hospital in Adelaide in a stable condition.
South Australian paramedics took two teenagers with minor head injuries to Mount Gambier Hospital in a stable condition.
It is believed the bus lost control and rolled onto its roof on Portland-Nelson Road near Black Swan Road about 4.25pm.
Portland police said investigations were ongoing.
The students from Adelaide's Scotch College were attending the school's senior and intermediate rowing camp in Nelson.
A statement from Scotch College principal John Newton said there were no other vehicles involved in the accident.
"As a result of this accident a small number of students have sustained minor to moderate injuries and are receiving appropriate medical treatment at medical facilities, including two students who have been airlifted to Adelaide," he said.
"Other students and staff members are receiving precautionary medical attention.
"All families of students and staff involved in the accident have been notified and are being updated as appropriate information comes to hand. We respectfully ask the community to refrain from discussing details of the accident at this time out of respect for the families involved.
"More information and updates will be shared as appropriate and as it comes to hand."
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