(NBC NEWS) -Â Gunfire erupted Monday morning at the gate of the National Security Agency's facility at Fort Meade in Maryland when two men disguised as women in a stolen car tried to enter, sources said.
A guard intervened and shot at least one of the men in the Ford Escape. A search of the vehicle turned up a gun and some drugs.
The condition of the men in the car was not confirmed. The NSA is a conducting the investigation into the incident, but the FBI was also on the scene.
"The shooting scene is contained and we do not believe it is related to terrorism," the FBI's Baltimore office said in a statement. "We are working with the US Attorney's Office in Maryland to determine if federal charges are warranted."
It's not clear why the men were trying to enter the facility, but one senior U.S. official called it a "local criminal matter."
White House spokesman Eric Schultz said President Obama was briefed on the incident.