Detectives have arrested a woman after a man was found with life-threatening injuries in Reservoir last night.
Emergency services responded to reports of a man found with injuries consistent with a stab wound in the vicinity of Reservoir Train Station about 8.45pm.
The man, who is yet to be formally identified, was taken to hospital with life threatening injuries.
His condition has since been downgraded.
Detectives arrested a woman at a Heidelberg Heights property earlier this morning.
She will be interviewed by investigators.
It is alleged this was a targeted incident and the people involved are known to each other.
The investigation remains ongoing.
Anyone with further information or footage is urged to contact Crime Stoppers on 1800 333 000 or submit an online confidential report at www.crimestoppersvic.com.au