The attack happened in the Ballynoe Gardens area of Bangor’s Kilcooley estate.
Sergeant Shankey said “At around 12.10 am it was reported that the two vehicles a Grey BMW and a White Ford Transit Van parked in the area had been set on fire.
“Police and NIFRS attended and the fire was extinguished.
“Both vehicles appeared to have their front windshields smashed and the fire started in the driver’s compartments. Both vehicles have been destroyed.
“Police are appealing for anyone who witnessed the incident or anyone who has any information that can assist with the investigation to contact officers in Newtownards on 101 quoting reference 10 of 06/08/19.
“Alternatively, information can also be provided to the independent charity Crimestoppers on 0800 555 111 which is 100% anonymous and gives people the power to speak up and stop crime.