A crime scene has been declared after four cars were set alight in Katherine.
Two vehicles were parked at a unit complex on Bernhard Street with the others nearby.
Firefighters were called to the scene just before 5am and extinguished the fires.
No one was injured.
Detective Senior Sergeant Byron May said investigations are underway.
“Police are urging anyone who may have CCTV footage of suspicious behaviour in the vicinity of the incidents at the time or has any knowledge of the circumstances to contact police on 131 444.”
“Please quote reference number 10256324.”