http://www.cnn.com/2011/US/09/10/ter...html?hpt=hp_t1
short version:
Three stolen trucks were added to a New York Police Department database because of the threat, said Deputy Police Commissioner Paul J. Browne. The database is connected to the NYPD's digital license plate readers.
"We're adding them in the interest of being prudent," Browne told CNN, emphasizing there is no known link to the terror threat.
Two of the trucks were owned by a construction company that operates at the World Trade Center site. They were reported stolen over a week ago.
A Budget rental truck was also stolen in a separate incident from a Jersey City, New Jersey, storage facility August 21.
"Whoever did it went to great lengths to cover their tracks," Browne said. "They cut lines to phones and surveillance cameras."