A 67-year-old man hiking in the Grand Canyon National Park died on the South Kaibab Trail, below Cedar Ridge. Officials believed that extreme heat created hazardous hiking conditions. The Grand Canyon National Park Service said at about 11:50 a.m. July 8, the Grand Canyon Regional Communications Center received a report of an unresponsive hiker.

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Hantavirus is primarily spread by deer mice, which are prevalent in the Grand Canyon area. The virus can cause a host of serious, even fatal, illnesses such as hantavirus pulmonary syndrome (HPS) and hemorrhagic fever with renal syndrome (HFRS), according to the Centers for Disease Control and Prevention ( CDC ).

A 63-year-old woman was found a quarter mile away from her vehicle. The investigation indicated she was returning to the trailhead when she collapsed.

A Coconino County, Arizona health official confirmed a case of Hantavirus at Grand Canyon National Park. Hantavirus is rare, but can be fatal, spread mostly by deer mice, rat urine, droppings, and saliva.

A park employee at the Grand Canyon was exposed to hantavirus, and a separate case of exposure to rabies in the park has also been confirmed.

The White Sage Fire was burning in Arizona bout 15 miles southeast of Fredonia in Coconino County and north of the Grand Canyon State Park.