ACT Fire and Rescue were called just before 3am and extinguished the blaze before the scene was handed to police for investigation.

So far in January, emergency services have been called to 25 car fires, one of which was not believed to be suspicious.

In December, emergency services attended more than 50 car fires, including one that spread to surrounding scrub west of Canberra.

Earlier this month, Minister for Police and Emergency Services Mick Gentleman wanted to see more arrests and convictions for car fires but backed the response from firefighters and police.

Police have called for people with information about the O'Connor fires to contact Crime Stoppers on 1800 333 000, quoting reference 6355381.