Were they smoking there in the moments immediately preceding the fire, and a dropped cigarette and maybe some sawdust or something somehow ignited a 35cm or whatever wide beam? And the smokers didn’t notice? But I think the answer is there weren’t any construction workers around in the time before the fire to be smoking anyway.

“Maybe it was an electrical thing or something” is far from conclusive evidence, and as OP was saying, completely incredible as a response to an event of this magnitude that attracted worldwide attention.

>pinpointing

I’m always surprised when I hear what fire forensics can figure out given the state of the evidence being worked with.

>any evidence pointing toward arson

The whole point of my original post was that all the circumstantial evidence points toward arson.