Four cars were set alight in Aranda in the early hours of Sunday morning (7 May).
At around 2 am, police attended Jalanga Crescent in Aranda. ACT Fire and Rescue were on the scene covering four vehicles with foam.
It is believed the vehicles were deliberately set alight using some form of accelerant.
Police are urging anyone who may have information that could assist with the 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.