High alert

A Chicago police officer and his explosives-sniffing dog check a box outside a terminal at O'Hare Intenational Airport on Tuesday. The airport emptied after flights were canceled there and across the country.
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( John Smierciak, Chicago Tribune / September 11, 2001 )

A Chicago police officer and his explosives-sniffing dog check a box outside a terminal at O'Hare Intenational Airport on Tuesday. The airport emptied after flights were canceled there and across the country.

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