Could there be dirty bomb threats at NFL venues this weekend?

StarPhoenixOfficials skeptical of NFL dirty bomb threat
Calgary Sun, Canada - 2 hours ago
By AP. WASHINGTON -- An Internet message claiming seven NFL stadiums will be hit with dirty bombs this weekend was met with "strong skepticism" yesterday by US ...
Officials express skepticism at dirty bomb threat San Jose Mercury News
NFL stadium dirty bomb threat doubted by experts Houston Chronicle
NFL dirty-bomb threat defused Chicago Tribune
Philadelphia Daily News - Kentucky.com
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