The blaze, dubbed "
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It added that complex terrain and bad weather hampered efforts to contain the fire, reports Xinhua news agency.
Some 208 firefighters are battling the blaze, the report said.
So far there is no report of damage or injuries, while the fire was zero per cent contained.
The fire, burning about 1.6 km south of the Arizona-Utah state line, forced authorities to cut roads to the North Rim of Grand Canyon National Park, evacuated a campground nearby and requested tourists to suspend their trips to the area.
The recent spell of hot and dry weather in many US Western states have led to several active wildfires.
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Fresh negotiations between military commanders from India and China starts today to end friction in Ladakh