A man has been arrested following the stabbing of an 18-year-old man in Blacktown this afternoon.
Emergency services were called to the intersection of Patrick Street and Main Street at approximately 2.20pm today, with the man sustaining a stab wound to his upper torso.
He has been taken to Westmead Hospital in a critical condition.
Officers established a crime scene and are currently investigating the matter.
A man has been arrested at a home in Blacktown.
Update: Police have confirmed that both the alleged attacker and the victim are 17-years-old.