A five-story building under construction collapsed Monday night in the Sao Paulo suburb of Guarulhos, although there were no immediate reports of casualties.
The collapse happened after most workers had left for the day, but it wasn't known if anyone was still on the site when the accident occurred.
Firefighters and other emergency personnel with flashlights climbed over the pile of rubble to check for possible casualties.
The collapse came just five days after two construction workers were killed when a crane fell at a Sao Paulo stadium that is slated to host the opening game of next year's World Cup. The accident sparked questions about Brazil's readiness to host the soccer tournament.