US Simulates Dirty Bomb Attack on Portland, Phoenix

Excerpt: A dirty bomb explodes in Guam, a U.S. territory in the Pacific. A few hours later, two more dirty bombs detonate, this time on the continental United States.

One bomb goes off at Sky Harbor Airport in Phoenix, killing an unknown number of people and spreading radiation throughout the airport.

Almost simultaneously, a dirty bomb goes off in Portland, Ore., detonated on the Steel Bridge, one of the city's main arteries across the Willamette River to the downtown area.

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