(NEWSnet/AP) — Dozens of hikers say they fell ill during trips to a popular Arizona tourist destination that features waterfalls deep in a gorge neighboring Grand Canyon National Park.

The federal Indian Health Service said Thursday that a clinic it oversees on the reservation is providing timely medical attention to people who became ill.

Environmental health officers with the regional IHS office were sent to the Havasupai reservation to investigate the source of the outbreak and to implement measures to keep it from spreading, the agency said.

“Our priority is the health and well-being of the Havasupai residents and visitors, and we are working closely with local health authorities and other partners to manage this situation effectively,” the agency said in a statement.

Coconino County health officials said Tuesday they received a report from a group of people who hiked to the waterfalls of “gastrointestinal illness” but didn’t know how many people have been affected.

The tribe’s land is outside the county’s jurisdiction.

A county health spokesperson said hikers should take extra precautions to prevent the spread of illness, including filtering water.

Thousands of tourists travel to the Havasupai reservation each year to camp near a series of picturesque waterfalls.

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