Students at a South Australian high school have "carried themselves really well" after the shocking stabbing of a 17-year-old girl on the campus, a senior education official says.
Department for Education executive director for partnerships Anne Millard says it's early days in the investigation of the incident at the Renmark High School but in time more details will emerge.
"It is natural for people to feel fearful, for people to feel concerned," she told reporters in Renmark on Wednesday.
"But over time we'll have a full picture and I have full confidence in the leadership team of the school.
"I have absolute confidence in the teachers and actually the students in this matter, all of the students have carried themselves really well."
Ms Millard said she it was her understanding that most students had attended school as usual and the feeling on the campus was "positive and connected".
An 18-year-old student is expected to face a bedside court hearing on Wednesday after being charged with serious assault, accused of stabbing a classmate at the school on Tuesday afternoon.
She allegedly attacked the 17-year-old girl with a knife, sparking a lockdown.
The victim was taken to Berri Hospital and later flown to the Royal Adelaide Hospital where she remains in a serious but stable condition.
Her accused attacker was arrested at the scene and was also flown to the Royal Adelaide Hospital for treatment of an undisclosed medical condition.
The state's education department said a dispute between the two students was thought to be behind the incident, which "did not represent a specific threat to the wider school community".
In a letter to parents, principal Mat Evans said students and staff would be offered counselling and support services.
"We share your shock at this event, which we are treating with the utmost seriousness," he said.