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    Phoenix on alert after string of interstate shootings

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Phoenix on alert after string of interstate shootings

Four vehicles were shot along an eight-mile stretch of I-10 in Phoenix. Arizona Department of Public Safety Director Frank Milstead tells CNN he suspects they're related.

Phoenix on alert after string of interstate shootings

Four vehicles were shot along an eight-mile stretch of I-10 in Phoenix. Arizona Department of Public Safety Director Frank Milstead tells CNN he suspects they're related.