The public have been asked to be on the lookout for the occupants of a white Ford Transit-type van with an English registration in the Lifford/Rossgier area.
The vehicle has been seen acting suspiciously in the area in the past couple of days.
Also, a black 4 door car with a partial KE registration was seen in different areas.
Local text alert groups fear these vehicles may be involved in some type of crime.
These vehicles have been reported to the Gardai.