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I have wondered, with a fire as large as the Palisades fire, how do the experts trace it back & identify root cause?
I remember maybe day 2 or so someone posted a photo supposedly of power lines sparking and catching brush on fire just at base of structure. ( near top of hill in Palisades )
I think with all the cameras available ( be it traffic cams, trail cams, peoples security cams etc etc ) they can narrow it down to location and investigate. If any sort of accelerant was used, I'm sure they have ways to detect traces of it.