What could cause a fire to spread so rapidly? One thing learned from the MGM fire in Las Vegas a few decades ago was wallpaper and wallpaper glue were extremely flammable and spread fire quickly across entire floors.
A new episode of the Damn Interesting podcast came out just today talking about the MGM fire. You should enjoy this. Here’s the link to the iTunes Podcast - https://itunes.apple.com/jp/podcast/damn-interesting/id571835813?l=en&mt=2