Four cars were set alight in Aranda early on Sunday morning and ACT Police are treating the incident as suspicious.
ACT Policing has launched an investigation and is seeking witnesses to the arson incident on Jalanga Crescent.
Police attended the scene around 2am on Sunday May 7 as ACT Fire and Rescue were covering four vehicles with foam to mange the flames.
Investigators found an accelerant was used to deliberately start the fires in all four cars.
Police are urging anyone who may have information that could assist with investigation to contact Crime Stoppers on 1800 333 000, or report via the Crime Stoppers ACT website. Please quote reference 6102189. Information can be provided anonymously.