Fayette County, PA explosion
https://www.wpxi.com/news/top-stories/pool-explosion-launches-500-gallon-propane-tank-into-fayette-county-home/MXOZ5SCXVNEKNFTGH7YWNSG3B4/
Found this in the comments. Same person also posted explanation on his face book page.
Weird stuff going on in PA lately. Public pools have been closed because of not enough staff.