Interesting, thanks. Well... if they've been doing renovations, I suppose those could be just a couple of the workers? It's kind of inconclusive.
Maybe one of the "workers" intentionally set the fire? This picture really doesn't prove anything.
Look at all the graffiti on the booksellers' booths in the lower left. I *never* saw that during my several trips to Paris years ago. Geez, it seems all of western civilization is going to hell these days...
True, cannot draw any conclusions from these images, but perhaps there’s a bread crumb or two.