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US daredevil begins Grand Canyon tightrope walk


US daredevil Nik Wallenda stepped out over a Grand Canyon tributary gorge Sunday, aiming to become the first person to walk a tightrope across the world-renowned landmark.

The 34-year-old, who was the first person to walk across the Niagara Falls last year, was wearing no safety harness for the stunt taking him 1,500 feet above the Little Colorado River in eastern Arizona.