Heavy rainfall in Sao Paulo, Brazil, resulted in a major traffic incident inside the Anhangabau tunnel. The downpour caused flooding that led to a mass pileup of vehicles, leaving motorists trapped within the tunnel infrastructure. Emergency services were required to address the scene, though specific details regarding the number of vehicles involved, the extent of injuries, or the duration of the tunnel closure remain limited in current reports.

The incident highlights the vulnerability of the city's subterranean infrastructure to extreme weather events. While the immediate cause of the pileup is attributed to the flooding conditions created by the rain, authorities have not yet released a comprehensive report on the mechanical or human factors that may have contributed to the collision. Traffic in the surrounding area experienced significant delays as responders worked to clear the wreckage and manage the water accumulation. As of now, there is no official word on whether the tunnel will remain closed for structural inspections or if it has been reopened to the public.