MONTREAL—Laval police are investigating after fires were set to three employee cars parked outside of the Signa Plus construction company early Tuesday morning.

The possible arsons started around 1:20 a.m. outside the signage company in the Ste-Rose sector of Laval. According to Laval police spokesman Franco DeGenova, the employees were out working when the fires were set.

While no one was hurt and the Signa Plus building wasn’t damaged, cans of gasoline were found nearby along with discarded flares. The cars all suffered major damage.

A firm that sets up and maintains temporary signage around construction sites, Signa Plus was targeted by arson less than a month ago. On August 17 the company’s Anjou office was the damaged by arson. Accelerants were found at the scene of that fire.

No suspicious vehicles or suspects were spotted in the northern Laval industrial park.