Sometimes spontaneous combustion is responsible, but authorities are still looking at what caused this huge pile of hay to go up in flames, especially since it was reported early Saturday morning.

Walla Walla County fire crews, Sheriff's deputies and others responded to the 3100 block of Reser Road for this one. No was was injured and no other property damaged in the blaze.  Officials did not say if they believe it's arson, but the time of the fire was certainly suspicious.

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