By Mark Duell
Last updated at 7:12 PM on 29th July 2011
The radiation detection system is part of a $200million security initiative in lower Manhattan.
But this is certainly broader in scope and sophistication.
Police began monitoring live feeds in 2008 from the cameras at a high-tech command centre in lower Manhattan - home to Wall Street, the new development at Ground Zero and other important sites.
‘We're talking about some of the most significant targets anywhere in the world,’ Police Commissioner Raymond Kelly said.
Changing landscape: One World Trade Center, left, rises up in the Manhattan skyline in this aerial photo
The NYPD is using a single, high-bandwidth fibre-optic network to connect all its cameras to a central computer system.
It's also pioneering ‘video analytic’ computer software designed to detect threats, like unattended bags, and retrieve stored images based on descriptions of terror or other criminal suspects.
Security around the World Trade Center site is a huge concern for New York police, who know terrorists could try to launch another attack on the new building in an attempt to insult the Americans.
New system: NYPD Commissioner Ray Kelly wants lower Manhattan to be the world's safest business district
Officials are desperate to avoid anything close to the tragic attacks of 9/11, when more than 2,000 people died in New York after a terrorist attack organised by Al Qaeda on the Twin Towers.
Two months ago fears were raised over the new World Trade Center skyscraper's security after 'confidential' detailed plans of the building were posted online on an official city website.
The secure schematics showed ground floor entrances and where the PATH rail tunnels will pass below, as well as mechanical rooms, ventilation shafts, exits, elevators and stairs.
But the Port Authority said the documents were 'scrubbed' of sensitive information about One World Trade Center's electrical systems, plumbing, security and fire safety.
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