A bus with 30 people on board, including children, has crashed near Harden, leaving one woman in a critical condition.
The crash happened at about 8.20am on Burley Griffin Way in Harden, north-west of Canberra.
A woman in her 60s was airlifted to Canberra Hospital in a serious condition with a head injury.
A 14-year-old boy was also airlifted after being treated for limb fractures.
Ambulance Inspector Stephen Pollard said neither patient had life-threatening injuries.
A further 26 patients, including children aged between 10 and 14, are being treated for minor injuries and will be taken to Harden Hospital for further treatment.
"I suppose we can say they were all shaken, but not stirred," Inspector Pollard said.
"We walked them up to the top of the hill. We did a quick triage to make sure none were seriously injured. Then we organised a bus to get them into Harden Hospital."
Seven NSW Ambulance crews were called to the scene including specialist medical teams and two rescue helicopters.
NSW Ambulance superintendent Mark Gibbs said the scene was confronting.
"Having to assess and triage a large number of patients like this is extremely challenging, paramedics had to work quickly under difficult circumstances," Superintendent Gibbs said.
"Turning up to a job like this is really difficult, often you don't know what to expect, especially when young children are involved."
Chief executive Owen Brown said the bus was new, and had left Griffith about 6am bound for Richmond in Sydney.
"It's pretty devastating to have one of our vehicles involved in an accident with injuries," he said.
The driver is at the scene assisting police, with a crime scene set up and the Major Crash Task Force on their way.
