The Ohio State Fair ride that malfunctioned last month, killing one person and injuring several others, was found to have “excessive corrosion” that ultimately caused a support beam to break, the ride’s manufacturer announced Sunday.

The Netherlands-based KMG International said in a statement that excessive corrosion was found on the inside of the gondola support beam, dangerously reducing the metal arm’s thickness over the years.

KMG said it sent a team of investigators to inspect the ride in Columbus, Ohio, and reviewed security footage of the fatal incident. It also conducted a “metallurgical inspection” of the ride.

The company said it has worked with industry safety experts to develop an” inspection protocol in the form of a Safety Bulletin to allow properly inspected and maintained rides to safely reopen.”

All rides at the fair were shut down following the fatal accident as officials re-inspected them, CBS affiliate WBNS-TV reports.

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