A young student has been killed after being hit by a school bus in Sydney’s southwest.

The accident occurred about 3pm on Wednesday outside Macarthur Anglican School in Cobbitty and left the 14-year-old with critical injuries, police said.

He was treated by paramedics at the scene and taken to Liverpool Hospital but died soon after.

The bus driver, a 54-year-old woman, has been taken for mandatory testing and is assisting police with their inquiries.

Officers from Camden Police Area Command and the Crash Investigation Unit have commenced an investigation into the circumstances surrounding the crash. A report will be prepared for the information of the Coroner.