A federal agency has opened an investigation into the death of an operator of Walt Disney World's monorail train.

The investigation launched Monday by the Occupational Safety and Health Administration could take as long as six months to complete.

The agency will look into whether any workplace safety rules were broken that led to 21-year-old Austin Wuennenberg's death Sunday when a monorail train crashed into another one.

The transit system, which shuttles thousands of visitors around the sprawling resort each day, is shut down while authorities investigate the incident.

A Disney spokesman did not immediately return a call for comment.

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