UPDATED at 6 p.m.

Two armed men -- reportedly dressed as women -- rammed their vehicle Monday into the gates of the National Security Agency at Fort Meade, which sparked a fatal shootout with police, according to media reports. One person is dead and one is injured in the incident.

"The shooting scene is contained, and we do not believe it is related to terrorism," Amy J. Thoreson, a spokeswoman for the FBI, told the Washington Post. SEE ALSO: Weekend of Drinking, Drug Use Preceded NSA Shootout: Reports

Initial reports said the "women" were in a car that took a wrong exit and arrived at the NSA gate. They were told to turn around and refused and then rammed the gate. NBC News, though, was one of the first to report that the two civilians appear to have actually been men dressed as women and that gunfire was exchanged. A gun and drugs were found in the stolen Ford Escape the men were riding in, according to NBC News.

WJLA reported that there were two damaged vehicles at the scene. The station showed an emergency crew loading an injured uniformed man into an ambulance.

One of the damaged vehicles is an NSA police SUV, according to images at WUSA9.