Inside, the warehouse was a big open hall, divided into metal cages piled high with different grades of insulating material.

NEWYORKER: Friendly Fire

Then, in the pre-dawn hours of Sunday, it turned into a scene of indescribable horror as sparks lit a fire in the soundproofing material above the stage, churning out black, toxic smoke as flames raced through the former beer warehouse, killing 231 people.

NPR: No Alarm, Only 1 Exit In Brazil Nightclub Fire