Maryland police have reported a “possible shooting” near the National Security Agency (NSA) headquarters.
NBC News aired aerial images of what appeared to be police surrounding a man on the ground in handcuffs. A black SUV appeared to hwere visible in the vehicle's front windows.
The local ABC affiliate reported that three people were injured and a suspect was arrested.
The NSA said the situation was under control.
The White House, in its official statement, said that President Donald Trump has been briefed about the incident.
More details are awaited.