A United Airlines flight spent about an hour circling over New Jersey before returning to Newark Liberty International Airport due to an on-board mechanical issue, according to the carrier and aviation officials.

United Flight 1321 departed the airport around noon Monday bound for Los Angeles, California, according to flight data. A mechanical issue was detected around 12:45 p.m., prompting a return to Newark, according to an airline spokesperson.

The Boeing 777 was transporting 362 travelers and 10 crew members.

The plane landed safely at Newark around 1:30 p.m. No injuries were reported on board.

United Flight 1321 returned safely to Newark Liberty International Airport to address a possible mechanical issue,” the airline said in an emailed statement. “We have arranged for a different aircraft to take our customers to Los Angeles this afternoon.”

The Federal Aviation Administration said it was notified of the incident and was investigating. Neither the airline nor the FAA immediately replied to questions about whether the mechanical issue was observed during takeoff or while the plane was in flight.

Thank you for relying on us to provide the local news you can trust. Please consider supporting NJ.com with a subscription.

Eric Conklin may be reached at [email protected].