Onlookers watch as authorities investigate the scene where a metal...

Onlookers watch as authorities investigate the scene where a metal factory was destroyed by an explosion, in Cabreuva, Brazil, Friday, Sept. 1, 2023. The explosion in southern Brazil killed several people and seriously injured at least a dozen others, state officials said. Credit: AP/Tuane Fernandes

SAO PAULO — An explosion Friday at a metal factory in the countryside of Brazil's most populous state killed four people and seriously injured at least 30 others, officials said.

Dozens of firefighters and rescue teams were sent to the site of the explosion in the city of Cabreuva, Sao Paulo Gov. Tarcisio de Freitas said on social media. Cabreuva lies about 90 kilometers (about 60 miles) northwest of the city of Sao Paulo.

Footage on Brazilian TV broadcasters showed the factory completely destroyed by the explosion.

Local media outlets said the blast was triggered by overheating equipment, and that hospitals in the area had been warned there would be a big influx of injured patients.

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