US tightrope walker Nik Wallenda
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Tightrope walker Nik Wallenda makes Chicago crossings

US tightrope walker Nik Wallenda has successfully completed back-to-back high-wire walks above the city of Chicago, watched by thousands of people.

The 35-year-old achieved the two skyscraper crossings without a safety net or a harness.

Fiona Bruce reports.

  • 03 Nov 2014
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