Terrifying. I hope no one was badly injured.

Fire was always my biggest concern when living in multi-family buildings. Can't protect yourself from whatever your neighbors might get up to.

I once lived in a townhouse next to a family where they wouldn't turn off the smoke alarm when cooking and would just let it keep going and going. And nobody would answer the door when this would happen, furthering my concerns. Had to call the fire department on them more than once. Thankfully, they moved out before too long.