POLICE called to a remote Inverclyde visitor centre after an intruder alarm was set off found signs of a possible theft in progress.
Officers attended at the Greenock Cut facility, Loch Thom, on Friday evening.
Sergeant Jason Logsdon said: “Upon the arrival of the officers, they observed that access appeared to have been forced to a security fence.
“There was a car parked nearby with equipment consistent for stealing fuel.”
Assistance from Police Scotland’s dog unit was requested and a search of the area found three males, one aged 40 and the other two aged 23.
One of the males was allegedly found to be in possession of a knife. All three were arrested and are scheduled to appear at court on a later date.
Area commander Chief Inspector Cameron said: “This was excellent team work by Inverclyde police officers with the assistance of our police dog and handler that has resulted in three males being arrested and the removal of an offensive weapon from our communities.”