Update: Pioneer Fire in San Bernardino County hits 100% containment by Tuesday afternoon
Briefly

The Pioneer Fire, which started on August 27, has been fully contained after burning 22.1 acres. However, the investigation into its cause remains ongoing.
Containment of a wildfire means it has been fully enclosed by control lines but does not imply the fire is completely extinguished; it may still burn internally.
While a fully contained wildfire indicates it won't spread further, controlling it involves actively managing any remaining flames within the containment area.
Containment percentage reflects the level of progress firefighters have made in surrounding the fire but does not always ensure safety for the surrounding areas.
Read at Sacramento Bee
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