(AP) — The National Weather Service says radar shows a tornado briefly touched down over the east runways of Denver International Airport, where thousands of people took shelter in bathrooms and stairwells until a tornado warning passed.

There are no immediate reports of damage.

Weather service meteorologist Kyle Fredin says a 97 mph gust was measured at the airport before communications with instruments there were briefly knocked out Tuesday. Dark clouds blanketed parts of the horizon over the plains to the east.

Airport officials say some flights headed to Denver were diverted elsewhere.

Television coverage showed the airport’s normally busy terminal was empty during the tornadowarning.

As the storm passed, police briefly blocked traffic from Interstate 70 to Pena Boulevard, which leads to the airport.