Transcript for Super Bowl Security
First, the unprecedented security and here's our senior justice correspondent, Pierre Thomas, tonight. Reporter: Security is the new York state of mind. Trying to keep this venue safe is a significant task, but the resources are here. Reporter: The security armada which includes fighter jets, water patrols and units prepared to deal with the most extreme situations now in full tilt, quickly responding to any potential threat. Another letter with white powder was found in a Manhattan hotel today. Like the letters discovered Friday, it turned out to be harmless. The quick and overwhelming response, another reminder the nation's biggest event is taking place near the country's number one terror target which happens to be the nation's biggest city, where anything can happen. Ten blocks from the NFL fan zone Amman accused of threatening former president George W. Bush was arrested yesterday with a loaded rifle, machete and gasoline in his car. Sources say he was obsessed with the president's daughter. Authorities say it had nothing to do with the super bowl. But shows how police of managing multiple potentially dangerous situation simultaneously. This is a jewelry store robbery. And another of an armoured car. We have to bear down, work together, work hard and leave nothing for chance. Reporter: No specific threat has been discovered. New York's police commissioner told me what he's most concerned about are so-called lone wolfs. Expect a huge police presence as fans stream to the stadium. They're expressly concerned about mass transit.
This transcript has been automatically generated and may not be 100% accurate.