NEW : This means the product will ship as received by the manufacturer, sealed, with all advertised components, and with the manufacturer warranty. The White House says there is no new information on a possible plot . Authorities are on the lookout for up to three possible attackers . No evidence exists so far that a plot is under way .
NEW : A second vehicle missing from World Trade Center site is recovered , police say . The White House says there is no new information on a possible plot . Authorities are on the lookout for up to three possible attackers . No evidence exists so far that a plot is under way .