It will still be years until all that is settled...but the crux of the argument was the “patrol” didnt lock the gates at sunset that night, like they were supposed to, and the people in the cave lit a fire that got away...
According to that Twitterer, this fire supposedly started at “The Arches” in the Mar Y Cel.
http://www.sbphototours.com/data/static/georgelogan/marycel.php