Echuca Police have responded to several reports of objects such as rocks and bricks being thrown through business windows.
VicRoads, Betta Electrical and Comdain Infrastructure were targeted sometime overnight on Sunday, September 18.
Detective Senior Constable James Scambler of the Echuca Police said it was likely that all of the incidents were connected.
“We are urging anyone who has information or CCTV footage to come forward,” he said.
If you have any information, phone the Campaspe Criminal Investigation Unit on 5483 1500 or Crimes Stoppers on 1800 333 000.