The Occupational Safety and Health Administration has opened an investigation into the collapse of an Amazon.com Inc. warehouse, according to a Labor Department spokesperson.

A tornado struck the Amazon delivery station in Edwardsville, Illinois, on Friday, killing six workers and destroying much of the facility at the peak of the holiday shopping season.

“OSHA has had compliance officers at the complex since Saturday, Dec. 11, to provide assistance,” the spokesperson said. “OSHA has six months to complete its investigation, issue citations and propose monetary penalties if violations of workplace safety and or health regulations are found.”

Reprinted courtesy of Josh Eidelson, Bloomberg and Spencer Soper, Bloomberg