It would take the worst terrorist attack in modern times to steal the Joelma Building fire's title as the deadliest high-rise fire. On February 1, 1974, the office building in downtown Sao Paulo, Brazil, was slowly filling with hundreds of employees starting their work day. Then an air conditioner on the twelfth floor sparked. Within hours, at least 179 people would be dead from the sudden and all-encompassing conflagration.