I was just building on my house (finally moving out of a rammed earth shack) when I went to get more wood at my warehouse... just to See this on my way.
Quite the picture, with the presumed culprit behind. Of course, I ran there in panic, but I was too late...
Aftermath in the morning. Here is everything I could save, mostly piled up outside as the chests burned as well. Mostly non-flammable stuff - stacks of wood, leather and cattails lost.
Luckily, my metal, scriptures and seeds were stored elsewhere - especially the latter is, of course, very important.
In terms of food, however... all my 4th generation pigs lived next to the warehouse.
A giant loss for sure, all of them burned. At least I could save enough chickens, which could quickly repopulate.
Well, outside of that, the warehouse is just a stone husk now... though the damn wooden roof survived most of it. Of course it had to hit the floor and containers.