The cracked coating of the glass bay
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US skyscraper viewing deck 'cracks'

A part of Chicago's Willis Tower's glass observation ledge cracked while people were inside, 103 storeys up.

A building spokesman said the damage was to the protective coating, possibly from a sharp item dropped on it, and there were no structural concerns

ABC News' Alex Perez reports.

Footage courtesy of ABC News

  • 30 May 2014
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