An anonymous telephone call was passed on to police on Wednesday morning to say a device may have been left at Legavallon Road.
Police have have appealed for people in the area to be vigilant.
The PSNI asked anyone who saw a suspicious object to contact police.
A number of roads have been closed in Drumsurn, near Dungiven, County Londonderry, after police received a report that an explosive device had been left in the area.