Three vehicles belonging to RTA workers have been destroyed after their carpark was firebombed in Sydney's south.
Firefighters were called to the RTA compound on West Botany Street at Rockdale around 10:15 on Sunday night.
The carpark had been firebombed, four staff cars were alight.
It took firefighters around 20 minutes to extinguish the blazes - three cars were completely destroyed.
The damage bill is estimated to be more than $100,000.
Police established a crime scene and are trying to find the culprits -- but curiously chose not to make details of the attack public.