Read previewDozens of tourists who hiked to a waterfall in the Grand Canyon have fallen ill, including one woman who had to be airlifted out of the national park. The Havasupai Tribal Council acknowledged the recent illnesses in a press release on Friday, describing it as "gastrointestinal symptoms." AdvertisementThe council said it held meetings with local health officials, who determined that the symptoms are affecting people across the northern Arizona region. AdvertisementA county spokesperson told the Associated Press that hikers should take precautions, including monitoring early signs of norovirus. Representatives for the Arizona Department of Health Services and Indian Health Services did not respond to Business Insider's request for comment.

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Persons: —, Mary Blair, Blair, wasn't, There's, Maylin Griffiths, Griffiths, hasn't Organizations: Service, Fox, Business, CBS, Tribal Council, IHS, Associated Press, Arizona Department of Health Services, Indian Health Services Locations: Havasu Falls, Arizona, iacomino, Coconino County