Nov. 18 (UPI) -- The National Transportation Safety Board announced Tuesday that an incorrectly labeled wire caused a containership to collide with the Francis Scott Key Bridge in Baltimore last year.

The federal agency released the key finding of its investigation into the catastrophic collision that killed six highway maintenance workers, destroyed a major regional transportation artery and upended trade at one of the country's busiest ports.

Jennifer Homendy, the board's chair, said, "This tragedy should've never occurred" in her opening remarks at a public meeting.

"As with all accidents we investigate, this was preventable," she said.

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