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NEW YORK, NY - MARCH 12:  Heavy smoke pours from the debris as the Fire Department of New York (FDNY) responds to a 5-alarm fire and building collapse at 1646 Park Ave in the Harlem neighborhood of Manhattan March 12, 2014 in New York City. Reports of an explosion were heard before the collapse of two multiple-dwelling buildings that left at least 11 injured.  (Photo by Andrew Burton/Getty Images)
NEW YORK, NY - MARCH 12:  Heavy smoke pours from the debris as the Fire Department of New York (FDNY) responds to a 5-alarm fire and building collapse at 1646 Park Ave in the Harlem neighborhood of Manhattan March 12, 2014 in New York City. Reports of an explosion were heard before the collapse of two multiple-dwelling buildings that left at least 11 injured.  (Photo by Andrew Burton/Getty Images)

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Mayor: 3 dead, 10 missing in explosion

CNN's Poppy Harlow reports on the new number of casualties in the New York City explosion.