Knox Crime Investigation Unit detectives have charged a man after two people were stabbed in Rowville this morning.
Emergency services responded to reports of an alleged altercation involving two men and a woman on a Wantirna South-bound bus shortly after midnight.
Police will allege one of the men produced a knife and slashed the other 59-year-old Scoresby man and the 53-year-old Ferntree Gully woman.
The male victim was taken to hospital with critical injuries, while the woman was taken to hospital with serious but non-life-threatening injuries.
After patrolling the area, officers located and arrested a 36-year-old Melbourne man.
He has since been charged with intentionally cause serious injury and intentionally cause injury.
The man was remanded and will next appear before Melbourne Magistrates' Court on 29 March.