Police officers from the New York City Police Dept., left, and Port Authority of New York & New Jersey, carry flowers inside the pit of ground zero during a ceremony honoring Sept. 11th victims during a ceremony in this file photo of Sept. 11, 2007, in New York. Bitter disputes between city police and the Port Authority police force in charge of the World Trade Center have flared up since Sept. 11 over how best to protect the site from future terrorist attacks. (AP Photo/Susan Watts, Pool, File)

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