EAST RUTHERFORD, NJ - OCTOBER 01: (FILE PHOTO) A general view of Giants Stadium at the start of the game between the Indianapolis Colts and the New York Jets on October 1, 2006 in East Rutherford, New Jersey. U.S. Homeland Security has alerted authorities and stadium owners that a website is claiming that seven NFL football stadiums will be targeted with radiological dirty bombs, but expressed doubts about the claims. The stadiums named in the threat are those in New York, Miami, Atlanta, Seattle, Houston, Oakland and Cleveland.