A tornado warning for Denver International Airport is over and no damage has been reported.
Passengers had to take shelter in bathrooms and stairwells for about a half-hour Tuesday after the warning was issued. The National Weather Service said a confirmed tornado was spotted in the area.
Television coverage showed the airport's normally busy concourse was completely empty during the warning period.
As the storm passed, police briefly blocked traffic from Interstate 70 to Pena Boulevard, which connects the interstate to the airport. Dark clouds blanketed parts of the horizon over the plains to the east.
Severe thunderstorms could still produce some strong winds and hail in the area and across Colorado's eastern plains.