"Keep your diesel bowser and vehicles locked away if you can," Sgt Browne said.
"Report any suspicious activity like vehicles driving around late at night or if you think someone is snooping around property."
Police were following up on the incidents, he said.
"It’s a good idea to lock stuff down, especially coming into the holiday season.
"People are tight on funds and we normally see an increase in dishonesty around the holiday period."
By Ben Andrews