An explosion injured three workers at a US Steel plant in Fairfield, Alabama, USA, injuring three workers, and a fire broke out at a Nucor steel plant in Huger, South Carolina, causing 'significant damage' but no human casualties.
The US Steel explosion happened on 21 September, three days after the Nucor fire on 18 September.
Both companies are conducting investigations into the incidents.
An ArcelorMittal spokesperson did not disclose details of the people injured or the extent of their injuries.
The Nucor fire was attended by 'multiple fire agencies' according to news reports.