(CNN) -- A strong tornado damaged parts of an airport in St. Louis when it hit Friday, officials said.

The tornado shattered glass, twisted metal and blew out plate-glass windows in the main terminal at Lambert-St. Louis International Airport, CNN affiliate KSDK reported.

Two people were transported to nearby hospitals with injuries, and others were treated at the airport, KSDK said.

Passengers were hit with flying glass and debris as the twister ripped off part of the roof in the airport's C concourse, the station reported.

Concourse C is used by American Airlines, AirTran and Cape Air, airport spokesman Jeff Lea said.

The National Weather Service said authorities believe the tornado was on the ground for several miles and observed the twister from a tower at the airport.

KSDK reported that the storm also blew the steeple off a church and forces authorities to close highways.