The project will rely largely on 3,000 closed-circuit security cameras covering about 1.7 square miles in and around the financial district. So far, about 150 cameras are in place, with 250 more coming on line by the end of the year and the rest by 2011.

The program was modeled in part after the so-called ring of steel surveillance measures in London’s financial district. But police officials in New York said it will exceed that effort in scope and sophistication.

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