OSHA on Monday said it has opened an investigation into the collapse of an Amazon warehouse in Illinois, after a tornado heavily damage to the building Friday.

Six Amazon workers died at the warehouse building collapse. The twister was one of at least 30 tornadoes that left a path of destruction across several states, including Kentucky, where more than 60 people were confirmed dead.

"I can confirm that OSHA has opened an investigation into the building collapse at the Amazon Warehouse in Edwardsville IL due to a tornado. OSHA has had compliance officers at the complex since Saturday, December 11 to provide assistance," Scott Allen, regional director for public affairs and media relations for the US Department of Labor, told CNN in an email Monday.

OSHA, which investigates all workplace fatalities and catastrophes, "has six months to complete its investigation, issue citations and propose monetary penalties if violations of workplace safety and or health regulations are found," Allen said.

Read more about the ongoing investigation here.