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by timr 17 hours ago
The second floor of the mall exploded for some reason, and the roof collapse is secondary to that. It seems to have happened after the earthquake and subsequent evacuation. There are videos of people leaving the mall:

https://x.com/yuto4388/status/2082060992377475247/video/1?s=...
1 comments
ktallett 8 hours ago
It is due to a gas leak that caused an explosion.
link
timr 1 hour ago
It definitely wasn't known at the time I wrote my comment, and as far as I know right now, they haven't announced the cause.

Few things would create an explosion of this size, so it's a logical inference, but you never know.

https://www3.nhk.or.jp/nhkworld/en/news/20260728_30/

Local (i.e. Japanese language) news is speculating an LP leak.

link