https://www.mercurynews.com/2019/05/21/ghost-ship-fire-inspector-says-no-evidence-of-arson-in-deadly-fire/

OAKLAND — Former Oakland Fire Marshal Maria Sabatini said there was no evidence of arson in the deadly Ghost Ship warehouse fire, potentially debunking a defense theory.

Sabatini, however, said that investigators were not able to determine a cause of the fire, likely because the fire itself burned some potential indicators. Only the origin of the fire was determined as having started in the back left corner of the warehouse on 31st Avenue.