Who?	Oakdale firefighters
What?	investigating second suspicious fire in two years at same location
Where?	Oakdale Adult School
When?	The fire started 5 a.m. Tuesday.
Why?	"That's still a mystery, but it was definitely arson," according to Oakdale Police Chief Bryant Tam, at the scene of the fire.
How?	Tam said investigators from his department found an empty can of turpentine and burn patterns to suggest the use of an accelerant; fire caused roughly $35,000 in damage.