Motorists, cyclists and walkers in the Carraroe area near Sligo town are being warned to be on the lookout after spikes were found embedded on the sides of a public road.
The spikes were discovered yesterday.
Gardaí are investigating if they may have been placed there maliciously.
Gardaí in Sligo are requesting anyone with any information to contact in Sligo on 071-91 57000 or the Garda Confidential Line on 1800 666 111
Members of the public that witness any similar activity, are asked to report gardai immediately.