The Federal Aviation Administration (FAA) on Monday said that it was investigating a series of false collision alerts that were sent to pilots landing at the Washington Reagan National Airport (DCA) on Saturday morning.

At least five flight crews have reported receiving false alarms on their onboard Traffic Collision Avoidance System, CBS News reported Monday, including flights from Pittsburgh, New York City and Minneapolis. It is not clear how many flights in total were affected. 

Pilots said that they received the notices when no other planes or objects were in the area. 

"It's been happening all morning. Let me know if you see anything. No one else has seen anything except for on the TCAS," one air traffic controller told an inbound flight. 

American Eagle flight 4469 out of Pittsburgh said it received the alert when landing at DCA, and were told by the system to take evasive maneuvers. The flight ended up diving a little bit before landing, but did not see another object.

"That's the same sort of reports we've been getting. It seemed like it had stopped but it sounds like it's starting again," a controller replied.

The FAA told CBS that some of the aircrafts executed "go arounds" because of the alerts, and it is investigating why the alerts went out in the first place. 

The incidents come amid increased scrutiny at DCA, which was the destination of the American Airlines plane involved in the fatal collision in January that killed all 67 people on the flight and helicopter. 

Misty Severi is a news reporter for Just The News. You can follow her on X for more coverage.