Police are investigating whether there is a link between an arson attack on a car in Strabane and another just across the border.
Two males wearing hooded jackets poured petrol over a car then set it alight in Innisfree Gardens in the early hours of Friday, November 21, the PSNI said.
Police are also aiding the Garda with enquiries into a recent arson attack on a vehicle in Lifford.
Appealing for information, Chief Inspector Andy Lemon said: "Police are not aware of who is carrying out these attacks or if these attacks are anyway connected."
But he added that if police do not receive a formal complaint an investigation cannot be instigated.