A man is in critical condition after allegedly being stabbed while attempting to stop a car theft in Langwarrin, in Melbourne's south-east.

According to ABC News, two 16-year-old boys have been arrested following the incident, which occurred early on Saturday, September 26. Police are investigating the circumstances surrounding the alleged stabbing and the attempted theft.

Emergency services responded to the incident after the man was allegedly injured while trying to intervene in the theft of a vehicle. He was taken to hospital for treatment and remains in a critical condition.

The incident occurred in Langwarrin, a suburb on Melbourne's south-eastern fringe. Police are continuing to establish the sequence of events, including what happened before the alleged stabbing and the circumstances surrounding the arrests.

The two teenagers arrested by police are both aged 16. Their arrest does not establish guilt, and any allegations against them will be considered through the criminal justice process.

Vehicle theft is a recurring issue investigated by police across Victoria, with authorities regularly warning motorists about securing vehicles and reporting suspicious activity. Incidents involving attempts by members of the public to intervene can also create significant risks, particularly when weapons are allegedly involved.

Police investigations following serious incidents generally involve gathering statements from witnesses, examining available CCTV or other recordings and establishing the movements of people and vehicles involved.

The man's critical condition means the investigation is also likely to focus on the severity and circumstances of the alleged attack. Further charges could depend on the evidence gathered by investigators and the legal assessment of the incident.

Residents in the area may also be contacted by police if they witnessed the incident or have relevant CCTV or other information.

Authorities have not indicated that the incident represents a broader threat to the public. The investigation remains ongoing.

The case highlights the potential danger of directly confronting suspected vehicle thieves. Members of the public who witness suspected criminal activity are generally encouraged to contact police rather than place themselves in situations where they could be injured.

Further information is expected as the investigation progresses and the legal process involving the two teenagers continues.