After digging through rubble and ash from the Pier 29 fire that broke out Wednesday afternoon, the San Francisco Fire Department says it has identified two potential causes that sparked the blaze: an electric malfunction, or a glitch in worker equipment.
Fire Department spokeswoman Mindy Talmadge said before the fire broke out, workers "were trying to use an electrical source in that area [where the fire ignited] and were having difficulty with that, and so they instead decided to use a generator."
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