Update: 86 Fire in Riverside County now brought under 100% containment
Briefly

Containment of a wildfire, often indicated as a percentage, signifies how much of the fire's perimeter is surrounded by control lines, but does not equate to the fire being extinguished.
Fire containment and control are different; containment stops the fire from spreading, while control involves managing its behavior within the established perimeter.
Read at Sacramento Bee
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