NEW YORK -- On a cold afternoon at the mouth of New York Harbor, a tiny yellow fishing boat bobs in the water as a flotilla of law enforcement vessels fitted with sophisticated radiation detection equipment closes in.
The boat has drawn suspicion by emitting gamma rays -- a sign it may be carrying a dirty bomb, packed with radioactive material. High-speed vessels from the New York Police Department and state Naval Militia halt the boat, tie it up and accomplish their mission of neutralizing an apparent terror threat.
The radiation was real, but the threat wasn't: The scene Thursday was a drill designed to test an ambitious NYPD-led effort called Securing the Cities. The program aims to detect and intercept radiological devices before they can wreak havoc on Wall Street and other high-profile targets in Manhattan, the heart of the nation's largest city.