Police in Burlington, Vt. say its residents are finding hidden AirTags and other GPS tracking devices on vehicles returning from Montreal.

The Burlington Police Department said last week that it had received two separate reports in the past month from residents who discovered the devices on their vehicles.

The force says the technology is allegedly being placed there by criminals, and is asking anyone who notices a suspicious device on their vehicle to call police.

The warning comes as police forces across Canada are battling rising levels of auto theft, with criminals using increasingly quick and sophisticated methods to track and steal desirable vehicles.