New York, NY, USA, 2004-08-01: The Department of Homeland Security warned Sunday of possible terrorist attacks against "iconic" financial institutions in New York City, Washington and Newark, N.J. The New York Stock Exchange (NYSE) and the World Headquarters of Citigroup are among the potential targets.<br />
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NYPD Police officers patrolling the area outside an office tower belonging to Citigroup at 53rd and Park Avenue.<br />
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Photo: Orjan F. Ellingvag/ Corbis  *** Local Caption ***