Three missing trucks being sought in New York City

As authorities search for three missing trucks in New York City in Washington, Dulles Airport has been partially evacuated after a bomb-sniffing dog alerted authorities Saturday night.
A Transportation Security Administration told CNN that a dog sounded the alert when cargo was being loaded into an aircraft. Virginia State Police are on the scene.
Explosive teams are at B Concourse area at Dulles investigated a number of canisters but found no explosives or anything harmful.
Tonight CNN is reporting that there are three vans missing in New York City, two of which were taken from a company that worked at Ground Zero over a week ago. The third is a U-Haul that was stolen on August 21 from a Jersey City, New Jersey location.
The theft of the U-Haul was planned with cut lines to phones and surveillance cameras.
This information comes in just days after the White House announced that there is a credible threat from terrorists set for the anniversary of September 11, 2001.
The three stolen vans in NYC have been added to the NYPD database because of the threat, still unconfirmed but credible. There are also two missing U-Haul vans in the Washington D.C. area.
It is thought that two of three suspects have traveled to the United States in the last week. These subjects speak English and have common names.
Police in New York City are on 12-hour shifts and extra personnel have been called in to New York and Washington.