New York City Police Department

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This Saturday, Dec. 17, 2011, surveillance photo provided by the New York Police Department shows a suspect wanted in connection with a homicide in the Brooklyn borough of New York. A woman burned to death in the elevator of her Brooklyn apartment building Saturday afternoon after a man ambushed her, sprayed her with liquid and set her afire with a Molotov cocktail, police said. (AP Photo/New York Police Department)

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New York City police officers prevent protesters from entering Wall Street from the east on Nov. 17, 2011. Two days after the encampment that sparked the global Occupy protest movement was cleared by authorities, demonstrators marched through New York's financial district Thursday and promised a national day of action with mass gatherings in other cities. (Associated Press)

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A New York City police officer salutes at the north pool of the Sept. 11 memorial as the national anthem is sung during the 10th anniversary ceremonies at the World Trade Center, Sunday, Sept. 11, 2011, in New York. (AP Photo/Justin Lane, Pool)

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New York City police and firefighters, and Port Authority of NY & NJ police officers salute during the singing of the "Star Spangled Banner" at the Sept. 11 memorial, during 10th anniversary ceremonies at the site, Sunday, Sept. 11, 2011, in New York. (AP Photo/Chip Somodevilla, Pool)

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President Barack Obama, accompanied by a New York City Police officer, New York City Firefighter, and Port Authority officers, carries a wreath to be placed at the World Trade Center site, in New York, Thursday, May 5, 2011. (AP Photo/Richard Drew)

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This photo released by the New York Police Department on Saturday, Feb. 12, 2011, shows a blood-stained kitchen knife that, according to police, Maksim Gelman used during a 28-hour stabbing rampage on Friday, Feb. 11. Police said three people died of knife wounds and a fourth was run down by Mr. Gelman as he made his getaway in a hijacked car. (AP Photo/New York Police Department)

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In this undated graphic released by the New York City Police Department, an example of what a typical suspicious package, that may actually contain a dangerous device, might look like. The graphic points out examples of stains, misspellings, irregular shape and strange odors, all of which by themselves or in combination are cause for concern. (AP Photo/NYPD)

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Members of the New York Police Department stand by as the Shrek balloon makes its way across 42nd Street during the Macy's Thanksgiving Day Parade on Thursday in New York. (Associated Press)

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Members of the New York Police Department stand by as the Shrek balloon makes it's way across 42nd Street during the Macy's Thanksgiving Day Parade on Thursday, Nov. 25, 2010 in New York. (AP Photo/Tina Fineberg)

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Members of the New York Police Department stand by as the Shrek balloon makes it's way across 42nd Street during the Macy's Thanksgiving Day Parade on Thursday, Nov. 25, 2010 in New York. (AP Photo/Tina Fineberg)

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This Thursday, July 1, 2010 photo shows a sign warning vehicles that Park Row in lower Manhattan is closed to traffic. Following the Sept. 11, 2001, terror attacks, the New York Police Department barricaded off its headquarters. (AP Photo/Mary Altaffer)