Vandals torched vehicles worth more than $80,000 at a Dandenong South factory.
They entered the locked car park in Pelson Court between 4.30pm on Friday 1 July at 4.30pm and 6.30am on Monday 4 July, police said.
A Bobcat and a tool trailer were attached to a white Isuzu tipper.
Greater Dandenong CIU Detective Senior Constable Karen McIntyre said the culprits stole $3000 in tools from the trailer then set the truck and Bobcat alight.
She urged anyone with information to call Crime Stoppers on 1800 333 000.
