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Police spokesman Anthony Guglielmi says Phelps was driving a late-model Cadillac Escalade Thursday night when it and a Honda Accord collided.
Guglielmi says the female driver of the Accord was "shaken up" and taken to a local hospital as a precaution.
Guglielmi says the accident is under investigation.
Phelps won eight gold medals at the Beijing Olympics.
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