One person is dead, and two more were hospitalized after an unauthorized vehicle tried to gain access to the National Security Agency campus in Fort Meade, Md., according to the NSA, which is investigating the incident, reports CNN.

"Shortly before 9:00 AM today, a vehicle containing two individuals attempted an unauthorized entry at a National Security Agency gate," Jonathan Freed, NSA director of strategic communications, said in a statement. "The driver failed to obey an NSA Police officer's routine instructions for safely exiting the secure campus. The vehicle failed to stop and barriers were deployed."

NSA police on the scene fired on the vehicle when it accelerated toward a police car, blocking its way, according to the NSA. One of the unauthorized vehicle's two occupants died on the scene. The other was hospitalized, as was an NSA police officer.

The two men who officials say tried to ram the main gate at NSA headquarters were dressed as women, according to a federal law enforcement official.

The FBI said they did not think terrorism was related to the incident.