The sheriff's office released surveillance video showing the man dumping some sort of accelerant around the lobby shortly before noon on Monday.
The man appears to light a piece of paper on fire and drop it, quickly igniting the fuel. He then runs out of the lobby before leaving in a blue SUV.
The sheriff's office said no one was hurt and there was no major damage.
The sheriff said they are trying to locate the man they identified as a person of interest, but have not released his name.