Three individuals were harmed and three suspects were arrested after an auto smashed outside the US National Security Agency's central command.
Gunfire rang out after the dark SUV moved toward the office in Fort Meade, Maryland, without authorization.
There is no sign yet of any connect to fear mongering, FBI authorities said.
The driver of the auto, a non-military personnel, and an NSA cop was taken to the clinic, the organization said.
FBI specialist Gordon Johnson said the harmed were altogether taken to healing center from the US Army base, which is around 30 miles (48km) north-east of Washington DC, after Wednesday morning's occurrence.
No wounds gave off an impression of being identified with the gunfire, he stated, and it showed up the gunfire was coordinated at the vehicle as a major aspect of NSA security convention.
"We accept there is no sign that much else besides a segregated episode of what occurred here today at the beginning of today," said Mr. Johnson, focusing on that it was not psychological oppression related.
The non-military personnel and the cop endured non-dangerous wounds, however, the state of the driver, an unidentified male, is obscure.
The other two individuals in the vehicle, the two guys, were taken under NSA guardianship.
The vehicle gives off an impression of being a contract auto, Mr. Johnson said.
He said that it was a continuous examination "we're still in the reality gathering business at the present time" when gotten some information about the intention of the vehicle's tenants.
CBS News pictures demonstrated the dark games utility vehicle with what resembled slug openings in the front windscreen and its air packs showed up conveyed.
It seemed to have crashed into some NSA-stamped solid blockade obstructs outside the establishment.
NBC News said its helicopter could see police encompassing a cuffed man sitting on the ground.
The FBI said on Twitter after the episode: "NSA police and neighborhood law implementation are tending to an occurrence that occurred at the beginning of today at one of NSA's protected vehicle section entryways.
"The circumstance is under control and there is no progressing security of wellbeing risk."
Another announcement from the NSA open undertakings office said: "a security episode" occurred at one of its checkpoints known as Canine door at around 07:00 neighborhood time (12:00 GMT).
Maryland Congressman Dutch Ruppersberger tweeted that the detailed wounds were not from shots.
US President Donald Trump has been advised of the episode.
"Our considerations and petitions are with everybody that has been influenced," said a White House representative, Lindsay Walters.
In March 2015, one individual was slaughtered and another truly injured subsequently to driving a vehicle up to the NSA's door, disregarding charges to stop.
News reports later proposed the two tenants of the vehicle may have been affected by drugs in the wake of going to a gathering.
Regardless of roadway signage, it isn't abnormal for drivers to go astray and wind up at one of the intensely monitored doors to the sprawling NSA complex, where outfitted government officers guide them to pivot.
