[BobL]

“An Aussie paper reports that there was 2750 tons of ammonium nitrate stored next to that grain elevator and a welders spark set it all off.”

If there were a relatively small fire taking place and munitions (or even fireworks) going off, I’d get the hell out of there, rather than risking setting off the ammonium nitrate. Nice try, Lebanon.

[glorgau]

Yep, sympathetic detonation of improperly stored explosives would do the trick.

There's a nice video: Massive explosion at Ukraine ammunition depot forces evacuation

I'd bet someone on site said "oops" just before it went off.