Byron Shire Council is appealing for information after three glass plates used to detect movement at the landslip site at Upper Coopers Creek Road were deliberately cracked.
The cracks from above ground were found after a regular landslip inspection by council engineers on Friday.
Council’s executive manager of community infrastructure, Phil Holloway, said the cracks appeared to have been caused from above the ground and not from below.
Mr Holloway said cracks on the top of the plates suggest that they have been purposefully smashed.
‘Further investigations into the cracked glass plates are ongoing and at this stage the road will remain open,’ he said.
‘The glass plates are a vital component in determining if the road can remain open or closed as they show landslip movement.’
Mr Holloway said the plates will be replaced but asked the community to report any suspicious behaviour at the site immediately.
He said reconstruction design planning and environmental studies were progressing, as well as planning for the proposed temporary road.