THIS PICTURE IS 14 of 45 TO ACCOMPANY THE PICTURE PACKAGE - NYPD A DECADE LATER. THE SERIES HIGHLIGHTS THE HEIGHTENED POLICE PRESENCE IN THE CITY. SEARCH KEYWORD "NYPD" TO SEE ALL THE IMAGES.

A New York Police Department Tactical Radiologic Acquisition and Characterization System (TRACS) boat escorts the Staten Island Ferry through New York Harbor August 31, 2011. The TRACS boat contains GPS and radioactivity detection software that enables the NYPD to monitor for unusual radioactive activity in the water ways around New York City. The police department has worked since 9/11 on a long-term project to permanently increase vigilance in Lower Manhattan and Midtown, home to prominent financial institutions and national landmarks. Picture taken August 31, 2011. REUTERS/Lucas Jackson (UNITED STATES - Tags: TRANSPORT CRIME LAW)