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396743 01: UNDATED FILE PHOTO The Golden Gate Bridge spans the bay in San Francisco, California. California Governor Gray Davis has issued a statement November 1, 2001 stating that authorities have received very credible threats that one of California's many suspension bridges may be targeted for terrorist attack between November 2 and November 7, 2001. (Photo By Justin Sullivan/Getty Images)

396743 01: UNDATED FILE PHOTO The Golden Gate Bridge spans the bay in San Francisco, California. California Governor Gray Davis has issued a statement November 1, 2001 stating that authorities have received very credible threats that one of California's many suspension bridges may be targeted for terrorist attack between November 2 and November 7, 2001. (Photo By Justin Sullivan/Getty Images)

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396779 08: The western span of the San Francisco Bay Bridge and San Francisco skyline seen November 2, 2001. Bridge security in California has been stepped up since California Governor Gray Davis announced authorities have received very credible threats that one of California's many suspension bridges may be targeted for terrorist attack between November 2 - November 7, 2001. (Photo By Justin Sullivan/Getty Images)

396779 08: The western span of the San Francisco Bay Bridge and San Francisco skyline seen November 2, 2001. Bridge security in California has been stepped up since California Governor Gray Davis announced authorities have received very credible threats that one of California's many suspension bridges may be targeted for terrorist attack between November 2 - November 7, 2001. (Photo By Justin Sullivan/Getty Images)

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Golden Gate Bridge, San Francisco

Golden Gate Bridge, San Francisco