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Tornado Warning In Denver Sends Chicago Travelers Scrambling

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Travelers gather in underground tunnels and Denver International Airport. (Credit: Holly Day)

Travelers gather in underground tunnels and Denver International Airport. (Credit: Holly Day)

(CBS) Severe weather in Denver forced thousands of travelers underground on Tuesday.

Chicagoan Holly Day emailed a picture of people crammed into a lower level train tunnel at the airport, with baggage and all.

Several reports of funnel clouds in the area forced them to take cover, CBS Denver reports.

Tornado sirens went off all across the city when the tornado was reported and the main road to the airport — Pena Boulevard — was closed for a short time.

Storm clouds over Denver International Airport. (Credit: Amateur photo via CNN)

Storm clouds over Denver International Airport. (Credit: Amateur photo via CNN)