Emergency services were called to a fire in Werribee at 4.30am this morning.
Multiple calls were received regarding a car fire in the underground car park at a residential building on Synnott Street near the corner of Werribee Street South.
Smoke quickly engulfed the building, forcing residents to leave.
The double-storey building was evacuated and a search was conducted with only one unit that required forced entry. The unit was empty and all occupants of the building were accounted for.
No sprinklers were activated at all, it is not known if any were installed.
The fire was extinguished at approximately 4.50am, police were called for suspicious circumstances, and a building inspector was called to assess the damage.