I’m sure it’s the terrorist threats. I heard on the news this morning that Bin Laden has issued a “message” each time there has been an attack. They believe his “message” is a signal to the cells to carry out whatever plan is next. Since he recently issued another message, the authorities believe another attack (possibly on the scale of 9-11) is planned for the immediate future. New York and Washington, DC are apparently the prime targets. (surprise)
I doubt it has any connection with the Amber Alert going on right now in Baltimore. They have the make/model/color and partial tag number of the car involved so it doesn’t appear likely they would be searching every car.