NASA says smoke from a massive wildfire burning in northern Nevada is visible from space.

Officials for the federal space agency said Tuesday a NASA satellite captured infrared imaging of the fire that has burned nearly 700 square miles (1,813 sq. kilometers) of remote rangeland - an area almost half the size of the state of Rhode Island.

More than 600 firefighters are now battling the blaze, dubbed the Martin Fire, which now is estimated to be 35 percent contained.

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The National Interagency Fire Center says it's the largest wild land fire currently burning in the United States. But it's not currently threatening any populated areas and no structure damage or injuries have been reported.

It first was reported on July 5 near the small rural town of Paradise Valley 200 miles northwest of Reno.

Authorities investigating the cause of the fire are asking for the public's help with any information about anyone who may have been camping in the area on the Fourth of July.

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All evacuation orders have been lifted and roads reopened at a western Nevada wildfire that threatened as many as 30 homes on the Sierra's eastern front about 15 miles (24 kilometers) south of Carson City.

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About 100 firefighters continued to battle the blaze that was burning mostly in sage brush Tuesday. It has charred an estimated 280 acres and is 60 percent contained.

No structures have been damaged or injuries reported.

Steve Eisele, deputy chief of the East Fork Fire Protection District, says a piece of heavy equipment operating at a new housing development near Genoa apparently sparked the fire Monday afternoon and gusty winds quickly spread the frames into neighboring brush along Jacks Valley Road.

Authorities set up a temporary shelter at a senior center in nearby Gardnerville after a voluntary evacuation order was issued, but the shelter was shut down at about 9 p.m. Monday.

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