Four arrested over train station stabbing

Three men and a teenage girl have been arrested after a stabbing at a NSW train station.

Policy say an 18-year-old man was found with a stab wound to his back at Sutherland Railway Station early on Saturday.

He was taken to St George Hospital with non-life threatening injuries.

Three men, 19, 23 and 26, and a 17-year-old girl were arrested less than an hour later at Engadine.

Police are questioning them at Sutherland Police Station.

Police are still searching for a fifth man thought to be linked to the stabbing.