Police and authorities are investigating a violent brawl at the Melbourne Immigration Detention Centre in Broadmeadows after several detainees were injured during an early-morning altercation.

The incident reportedly occurred early Tuesday morning, with multiple detainees involved in a confrontation inside the facility. Ambulance Victoria attended the centre, with three men treated at the scene before being taken for further medical assessment. Their injuries were reported as stable.

Authorities subsequently searched the facility and found makeshift weapons, including improvised prison-style shivs. The discovery has raised further concerns about security and safety inside the detention centre.

The Melbourne Immigration Detention Centre houses people who are being held for immigration-related reasons, including some serious offenders awaiting deportation. The facility has previously faced scrutiny over staffing, training and security arrangements.

The latest incident is expected to be examined as part of an internal review. Authorities will investigate how the confrontation began, how weapons were obtained and whether additional security measures are required.

The incident comes amid broader discussion about conditions inside Australian immigration detention facilities. Staff safety, detainee welfare and security are key issues for authorities responsible for operating the centres.

Australian Border Force has acknowledged the incident but has not provided extensive details while the review continues.

Police and facility officials are expected to examine CCTV footage, witness accounts and other available evidence to establish the sequence of events. Any criminal offences identified during the investigation could lead to further action.

The incident did not result in a reported escape, but the discovery of improvised weapons highlights the security challenges faced by detention facilities.

For the surrounding Broadmeadows community, authorities have indicated that the incident is contained within the detention facility. The investigation will determine whether additional security measures are necessary.