That would be my guess. Looking at it, it's just a shell of a building, and it looks like part of it collapsed when presumably they were not expecting it to do so.
Sad for the person who lost their life and their familly.
There has been an explosion with one confirmed dead.
The site is still being demolished & they do use explosives to drop the larger sections of buildings.................the cooling towers came down back in 2014 I think.
Locals are normally warned when they are going to go bang with demo charges.