COLORADO SPRINGS, COLO. -- A potentially hazardous material incident left nine Schriever Air Force Base personnel ill Wednesday morning.

At around 10 a.m. some personnel at the base began complaining of throat irritation.

They were evaluated on site and then transported to the hospital for observation.

After an examinatio n of the area by first responders and the Air Force Bio-Environmental Engineers, the building was cleared of any potential hazardous materials.

The cause of the incident is under investigation and all nine people have been released from the hospital.