The U.S. Navy said Tuesday that very low levels of airborne radiation were detected at Yokosuka and Atsugi bases, about 200 miles to the north of the Fukushima nuclear power plant, Fox News reports.

"While there was no danger to the public, Commander, Naval Forces Japan recommended limited precautionary measures for personnel and their families on Fleet Activities Yokosuka and Naval Air Facility Atsugi, including limiting outdoor activities and securing external ventilation systems as much as practical," a statement said.

"These measures are strictly precautionary in nature. We do not expect that any United States Federal radiation exposure limits will be exceeded even if no precautionary measures are taken," it added.

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