Amazon will not receive a fine after one of its warehouses collapsed in a tornado, killing 6 workers

• OSHA conducted an investigation after an Amazon warehouse collapsed in a tornado, killing six.
• The DOL said Tuesday Amazon met "minimal federal safety guidelines," so it won't be fined.

The Department of Labor (DOL) announced Tuesday that it would not fine Amazon over the collapse of one of its warehouses and subsequent deaths of six workers.

The roof of Amazon's warehouse in Edwardsville, Illinois, collapsed after being struck by a tornado on December 10. The Occupational Safety and Health Administration (OSHA) launched an investigation, following the collapse.

The collapse was the subject of intense scrutiny from the media and lawmakers, and some of the deceased workers' families, as well as some drivers who were in the warehouse at the time are in the process of suing Amazon.

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The DOL said OSHA investigators found Amazon met "minimal federal safety guidelines."

OSHA said in a letter to Amazon it had identified risks in the warehouse, including the fact that not all the employees did not know where the designated storm shelter was.

The investigators also found the megaphone, which was supposed to be used in disaster situations according to the facility's emergency procedures, was locked in an inaccessible cage.

Amazon spokesperson Kelly Nantel told CNBC: "OSHA's investigation did not find any violations or causes for citations, but we're constantly looking to innovate and improve our safety measures and have already begun conducting additional safety and emergency preparedness drills at our sites and will carefully consider any OSHA recommendation that we have not already."

Amazon did not immediately respond when contacted by Insider outside of normal working hours.