A student has been arrested at a nearby car park after a teacher and two other students were stabbed at Bonnyrigg High School, in Sydney's west.
Emergency services were called to the school on Elizabeth Drive, just before 8:45am today.
Police said the school was put into lockdown after the incident.
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48-year-old female teacher was stabbed in the back, while two Year 11 students — a 16-year-old boy and a 15-year-old girl — were stabbed in the shoulder.
The woman and the boy were taken to Liverpool Hospital and girl was taken to Westmead Hospital.
All three are in a stable condition and their injuries are not believed to be life-threatening.