Here’s what happened.

A NORAD F-16 fighter jet intercepted a civilian aircraft Saturday morning after it entered restricted airspace near Camp David while President Donald Trump was staying at the presidential retreat in Maryland.

The incident unfolded over Thurmont, Maryland, at approximately 7:50 a.m. EDT on September 19, according to an official statement from the North American Aerospace Defense Command.

During the interception, the military fighter deployed flares in an effort to get the pilot’s attention and communicate with the aircraft.

The plane was ultimately escorted safely out of the restricted area, officials said. NORAD did not indicate that the aircraft posed an intentional threat.

F-16 Scrambled Near Camp David

The unusual encounter came while President Trump was spending the weekend at Camp David, the presidential retreat located in Maryland’s Catoctin Mountains.

Airspace around the area was under a Federal Aviation Administration VIP Temporary Flight Restriction covering September 18 through September 20.

NORAD had publicly reminded general aviation pilots before the weekend to check current Notices to Airmen, commonly known as NOTAMs, before taking off and to follow all procedures associated with temporary flight restrictions.

Despite those restrictions, a general aviation aircraft entered the protected area Saturday morning, triggering a response from NORAD.

Military officials said an F-16 was dispatched to intercept the aircraft.

NORAD Fighter Jet Deploys Flares

One of the most noticeable moments in the encounter came when the NORAD fighter released flares.

People on the ground may have been able to see them, according to the military.

NORAD said the flares were deployed to get the pilot’s attention and help relay directions.

The command emphasized that the devices are used with safety in mind and burn out rapidly before reaching the ground.

Although seeing an F-16 deploying flares near a presidential retreat could appear dramatic, such measures are among the methods military pilots can use when attempting to communicate with an aircraft that has entered restricted airspace.

Aircraft Safely Escorted From Restricted Area

NORAD said the civilian aircraft was successfully escorted away from the protected area without further incident.

Officials did not immediately disclose the identity of the pilot or provide a public explanation for why the aircraft entered the restricted zone.

There was also no indication in NORAD’s initial statement that the pilot deliberately entered the restricted airspace or intended to threaten the president or Camp David.

That distinction is important because restricted-airspace violations can occur for several reasons, including navigation mistakes or a pilot failing to review updated flight restrictions.

Whatever caused Saturday’s incident, the military response was immediate.

Strict Flight Restrictions Surround Presidential Visits

Security around presidential locations extends well beyond the ground.

Temporary flight restrictions are regularly established when the president travels, creating protected areas where most civilian aircraft are prohibited from operating unless specifically authorized.

NORAD had announced ahead of the weekend that it would enforce the FAA restriction over Thurmont and warned that military aircraft could respond to pilots who failed to comply.

Pilots are responsible for reviewing current flight restrictions before departure.

NORAD also says that if a general aviation aircraft is intercepted, the pilot should immediately monitor emergency frequencies and reverse course while awaiting additional instructions.

Camp David Security Draws Attention

Camp David has served presidents for generations as a private retreat away from Washington, D.C.

Because the president can conduct official business and meet with senior advisers and foreign leaders there, the surrounding area receives extensive security protection whenever it is in use.

Saturday morning’s airspace violation therefore prompted a rapid military response.

A NORAD F-16 intercepted the aircraft, deployed flares to attract the pilot’s attention and ultimately escorted the plane away from the restricted area.

No injuries were reported, and the military said the situation was resolved safely.

For people living around Thurmont and the Catoctin Mountains, however, the appearance of a fighter jet and visible flares provided a striking reminder of the security measures that can quickly go into effect when the president is staying at Camp David.

The unanswered question is what led the civilian aircraft into the restricted area in the first place.

As of the initial NORAD announcement, officials had not publicly identified the pilot or provided additional details explaining the airspace violation.