And this is obviously a cause for concern and requires a heightened state of alert.
The CTC, fearful of another strike around the July 4 holiday, is "on a heightened state of alert, " says Bernazzani.
Spokesmen for New Jersey transit systems and Amtrak said they remained on a heightened state of alert, as they have been since early July.
Many governments were already on a heightened state of alert due to vague but persistent intelligence suggesting an attack may be imminent in Europe or elsewhere.
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The U.S. Customs Service said the added scrutiny is not an overreaction to threats of terrorism, but the result of following procedures during a heightened state of alert.
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On Friday, an American military official said U.S. forces in Europe are on a heightened state of alert in response to a deteriorating security situation in the Libyan capital.
When Russian sensors detected an ambiguous but potentially threatening situation, the standard procedures were followed, leading to a heightened state of alert and preparations for ordering a retaliatory strike.
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Italian security forces were put on a heightened state of alert following the start of the U.S. and British attacks on Afghanistan, while the government activated a crisis unit to monitor the situation.
John Sullivan of the Boston Water and Sewer Commission testified that since September 11 the nation's drinking water utilities have been on a heightened state of alert to protect against the potential disruption of water service and biological or chemical contamination of drinking water.
Even after the state of heightened alert ends, Customs officials don't expect the slowdown at the border to abate much -- because the current volume of 6, 500 trucks a day through the Detroit crossing is expected to rise to more than 7, 000 next year.
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