Emergency services were called to Westfield Parramatta, on the corner of Campbell and Church streets, about 4pm today.
A 17-year-old boy was found with slash wounds to his arms and back.
The teenager’s injuries are not believed to be life-threatening.
He was treated by paramedics at the scene and taken to hospital in a stable condition.
Police were told there had been an argument with a group of young people.
The attack is believed to have been targeted and there is no threat to public safety.
A crime scene has been established and anyone with information has been asked to contact police.
