Three people are believed to have been shot outside the NSA campus with a police officer is among those injured in the shooting.
Photographs show a black SUV with bullet holes in the windscreen ouside the Fort Meade centre. The car appears to have crashed into a concrete barrier.
The lone gunman has been taken into custody. The FBI is investigating the situation, ABS reports.
Police were called to an incident at or near the main visitor gate.
None of the injuries are believed to be life-threatening, local media reports.
Road closures are in place by the scene with Route 32 near I-295 closed in both directions.
This is a breaking story, more to follow…