Construction site owners in the region are being reminded to secure all valuable items and tools.
This appeal follows the theft of an air compressor from a locked container on a building site in the Castleshane area of Monaghan earlier this week.
Anyone with information is asked to contact Monaghan Garda Station.
Gardaí are using the incident to remind anyone with a construction site to ensure all items of value are secured safely in a well-lit area, and that there are as few entry points to the site as possible.
Other tips they can use is to park machinery at site entrances, and mark and photograph power tools so they can be identified before they are sold on.