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An explosion at slag tanks at ArcelorMitall’s steel plant in Lazaro Cardenas in western Mexico on Tuesday caused no injuries, the world’s biggest steel-making said in a statement.

“There was a thermal reaction in our slag pools, which produced a roar that was perceived by the city, without causing harm to people,” the company’s Mexican unit said in a tweet.

Video footage published Mexican media showed an explosion and large flames reportedly at the site.