Western Sydney Salon Stabbing Victim Dies

A young man stabbed in a Sydney hair salon in a suspected targeted attack has died in hospital.

The 20-year-old died in Liverpool hospital about five hours after he was stabbed multiple times in the upper body at a salon in Bossley Park.

Detectives are "treating the incident as targeted", they said in a statement on Friday.

The alleged assailant, aged 18, was arrested on nearby Tallowood Crescent.

"He's assisting police with their inquiries," a NSW Police spokesman told AAP.