A 13-year-old boy is seriously injured after being stabbed in the back and arm during an "absolutely horrific" attack at a western Sydney school.
The boy was stabbed at Arthur Phillip High School in Parramatta just before 8.30am on Monday.
He has been taken to Westmead Children's Hospital in a stable condition, a NSW Ambulance spokesman said.
Four ambulance crews were sent to the school and a strong police presence remains in place. No arrests have yet been made.
NSW Ambulance inspector Joe Ibrahim said the incident was "every parent's worst nightmare".

A file photo of students outside Parramatta's Arthur Phillip High School. Source: AAP
"Our paramedics did an exceptional job in stabilising and providing treatment for the teenager who had suffered some pretty serious injuries," he added.
"It's absolutely horrific when we respond to jobs like these, especially when it involves someone so young. It's every parent's worst nightmare."