Reports are that the shooting happened at Terminal B. No other details were immediately available.
Houston police were called to a "discharge of firearm" at Terminal B. An armed male at the ticket counter suffered at least one gunshot and was taken to a local hospital.
Police say they are not looking for anyone else at the airport who may be involved in the shooting.
The FAA has issued a ground stop for all flights at the airport.
ABC7'S sister station KTRK has a news crew on the way and will bring the latest once there is more information.