At least 15 patients are being evaluated and the school has been evacuated at Paredes Middle School in South Austin, Texas.
Officials say that there was gas odor detected at the school, but it is not clear if the source has been identified. EMS are on the scene, but no further details are available at this time.
Originally only three people were under evaluation, but that number has grown to 15. At least three ambulances are on-scene.