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This Sept. 27, 2010, file photo shows hikers on the South Kaibab Trail in Grand Canyon National Park, Ariz. The Grand Canyon is imposing new restrictions on hikers who are turning up in larger numbers to complete grueling "rim to rim" excursions from one end of the canyon to the other. The popularity of the hikes have created problems with litter and safety as people need to be rescued. (The Associated Press/file photo)

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Officials say groups of hikers and runners who want to do grueling excursions across the Grand Canyon will soon need a permit.

By Felicia Fonseca August 28, 2014