The ATF said the two stairwells in the building did not lead to exits.
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The cause of the fire is still under investigation, despite earlier reports of a refrigerator being a possible point of origin. There is no evidence of arson at this time.
Officials said this is the highest number of fatalities in a structure fire in the U.S. in the last 13 years.
Click here to donate to the Alameda County Disaster Relief Fund.
If you are trying to locate a loved one, or need information call 510-382-3000.
PHOTOS: Some of the victims of the tragic Oakland Ghost Ship fire
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PHOTOS: A look inside the Oakland Ghost Ship collective warehouse
Click here for all ABC7 News stories, videos, and photos from the Ghost Ship warehouse fire.