Guards have shot one man dead and seriously wounded a second after a car tried to force its way through the entrance gate of the United States NSA spy agency in Maryland.<br /><br /> One of the officials trying to protect the site at Fort Meade has also been hurt.<br /><br /> Reports say the FBI do not believe the incident is related to terrorism and that the men in the car were both dressed as women.<br /><br /> Television helicopter video footage showed two damaged vehicles outside the gates and at least one person in uniform being wheeled to an ambulance.<br /><br /> One of the vehicles was marked ‘police’ on the side and had its bonnet up. The other, a dark vehicle, had front-end damage.
