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A new report on the 2017 fatal London tower disaster details how fire spread.

Six months after an explosion and fire destroyed a grid-connected energy-storage battery facility in Surprise, Ariz., investigators are still trying to figure out all that happened. 

For more than two decades, science has recognized that building fires have become hotter, faster-spreading and more toxic. 

As wildfire warnings continue to race through California, utility giants PG&E and Southern California Edison (SCE) are stepping up their fire-risk mitigation plans for workers to harden infrastructure and manage vegetation.