A violent incident occurred on Sunday afternoon in St Albans, Victoria, when a planned online marketplace transaction turned into a stabbing. Three males were involved in the altercation, with a 17-year-old and a man in his 20s sustaining critical injuries requiring hospitalisation. A 23-year-old man also suffered serious stabbing injuries. The incident took place around 1:20pm when the three individuals met outside a house on Cobham Street as part of a marketplace deal. Police from the Brimbank Crime Investigation Unit are currently investigating the circumstances surrounding the stabbing. Detectives confirmed that no further individuals are being sought in relation to the violence and no arrests have been made to date. Authorities are urging anyone with information, including CCTV or dashcam footage, to contact Crime Stoppers on 1800 333 000 or via the website www.crimestoppersvic.com.au. The incident has been classified as a crime-related event, with police focusing on the details of the online transaction that led to the confrontation. The St Albans community has been advised to remain vigilant and report any suspicious activity. The case remains under active investigation, with police working to establish the full sequence of events that led to the violent outcome. The three victims are currently receiving medical treatment at local hospitals, with their conditions described as critical but stable. The police have not released the names of the individuals involved, maintaining privacy for the victims and their families. This incident highlights the potential dangers associated with meeting strangers for online transactions, particularly in the context of marketplace exchanges. Authorities continue to advise the public to exercise caution when engaging in such transactions, recommending that meetings take place in well-lit, public areas with a companion present. The Brimbank Crime Investigation Unit has confirmed that they are reviewing all available evidence to determine the exact circumstances of the altercation. The community is being kept informed through regular updates from local law enforcement.