Police in Portadown are urging anyone who comes across, or who notices any suspicious objects in the Old Lurgan Road area of the town not to touch them.
The warning came in shortly before midnight and follows an uncorroborated report earlier on Tuesday evening, November 1, that some type of device had been left in the area.
Police are appealing to members of the public living in, or travelling through these areas, to be vigilant and not to touch any suspicious objects but to contact police immediately by calling 101 or 999 in an emergency.
No roads have been closed at this time.
There are no further details at this stage.