Cal Fire officials confirmed late Tuesday investigators are looking into a shed fire in the town of Cobb as one possible source for the massive Valley Fire.
Investigators spent Tuesday looking at a shed on Higher Valley Road in Cobb, a town of about 18,000 people. The shed is across the road from where the first call came in to report the fire.
Officially, Cal Fire said the cause of the fire is under investigation.
Crews on Tuesday were able to get 30 percent containment on the devastating fire, which sped through Middletown and other parts of California's rural Lake County, killing one person.
The Valley Fire had charred 70,000 acres by Wednesday morning and has been burning since Saturday.