If you were in or around Philadelphia on Monday morning, you likely heard a fighter jet flying overhead.
According to officials with the North American Aerospace Defense Command (NORAD), the jet everyone saw -- an F-15 fighter plane -- responded to a civilian aircraft that entered a Temporary Flight Restricted area over Wilmington, Delaware without proper clearance.
It happened around 9:20 a.m. while President Joe Biden was in his home state of Delaware.
NORAD said their F-15 intercepted and guided the general aviation plane out of the TFR area shortly after it violated the air space.
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People across the Philadelphia region took to social media for answers as to why they saw the impressive jet flying low overhead.
In a statement, NORAD said it “employs a layered defense network of radars, satellites, and fighter aircraft to identify aircraft and determine the appropriate response.”