According to NORAD, an F-15 fighter aircraft responded to a Cessna plane that entered a Temporary Flight Restricted area without proper clearance over Wilmington, Delaware.
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President Joe Biden was in Delaware at the time.
The low-flying jet caught a lot of people off guard.
"I didn't see anything, but it sounded like a plane was actually about to crash land," said Michelle Crutchley.
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"I got a little nervous because I didn't know where it was coming from. It sounded like some large thing above us, so it was a little scary," said Katie Aikins.
Officials said the aircraft exited the restricted airspace shortly after.
It was not yet clear what type of punishment the pilot could face.