Gunfire reportedly rang out after a car pulled up at the entrance to the facility. Authorities took one person into custody near the facility, the New York Post reported.
Bullet holes were seen in the vehicle's windshield at one of the NSA's vehicle entry gates.
None of the victims -- including a police officer -- are believed to have suffered life-threatening injuries.
"Our thoughts and prayers are with everyone that has been affected," Walters said.
In March 2015, one person was killed and another seriously wounded after driving a vehicle up to the NSA's gate, ignoring commands to stop.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)