Dense fog envelopes Manhattan (9)

Manhattan midtown is seen shrouded in fog from the Observation Deck of Rockefeller Center in New York City, the United States, Dec. 14, 2015. Dense fog envelopes New York City as unusual warm weather continues on Monday. Because of the restricted visibility created by Monday morning's fog, the National Weather Service issued a dense fog advisory for all of New Jersey and New York City. (Xinhua/Wang Lei)