Videos showing downed power lines apparently sparking some of the early blazes in the Maui wildfires have become key evidence in the search for a cause.

Awakened by howling winds that tore through his Maui neighborhood, Shane Treu went out at dawn and saw a wooden power pole suddenly snap with a flash, its sparking, popping line falling to the dry grass below and quickly igniting a row of flames.

He called 911 and then turned on Facebook video to livestream his attempt to fight the blaze in Lahaina, including wetting down his property with a garden hose.