The alarm came to SOS Alarm at 06 o'clock on Saturday morning, and nine units then rushed out to fight the fire.
A total of seven cars were destroyed, and the garage suffered massive damage.
The area is cordoned off.
- We have classified it as arson, but there is no suspect, says Helene Daun, head of the preliminary investigation at the crime scene in Västerås in a comment to VLT.