South Australian Police have launched an investigation after a suspicious fire damaged a commercial building in Rosewater, north-west of Adelaide.

Emergency services were called to a business premises on Grand Junction Road at approximately 4:20am on Saturday, 7 November 2026, after reports of flames coming from the building.

Police officers and Metropolitan Fire Service (MFS) crews attended the location and immediately began responding to the emergency.

Firefighters worked to control and extinguish the blaze before it could cause further damage to the property. Their response helped contain the fire and prevent the situation from escalating.

According to South Australia Police, the fire is believed to have been deliberately lit. Investigators are treating the incident as suspicious and are examining the circumstances surrounding how the blaze started.

The fire caused damage to the front section of the business building. Police have not publicly confirmed the full extent of the damage or released information about the estimated financial losses.

Investigators are now seeking information that could help establish who was responsible for starting the fire and whether anyone was seen behaving suspiciously near the premises before the emergency was reported.

Authorities are particularly interested in information from people who were travelling along Grand Junction Road or living nearby during the early hours of Saturday morning.

CCTV recordings from nearby businesses, residential properties and vehicles may also assist investigators in identifying suspicious movements around the location.

Police have encouraged anyone who witnessed unusual activity in the area to contact Crime Stoppers.

The incident has raised concerns among local business operators because deliberately lit fires can create significant risks for nearby properties, workers and residents.

Emergency services have reminded the community that suspicious activity should be reported promptly so authorities can investigate potential threats before further damage occurs.

At this stage, police have not announced any arrests or identified a suspect in connection with the fire.

Investigations remain ongoing as officers work to establish the cause of the blaze and identify those responsible.