Lake Oroville, Calif. (KCRA / CNN) -- Evacuation orders have been issued for the Ponderosa Wildfire burning east of Lake Oroville in California.
It now at about 600 acres.
The cause is unknown.
Mandatory evacuations are in place.
Multiple homes have been destroyed or damaged.
Cal Fire said the flames were threatening at least 60 structures, but officials did not say how many were damaged by the wildfire.