A Frontier Airlines flight from Puerto Rico to Chicago O'Hare International Airport was diverted to Miami on Sunday after a passenger attempted to open an emergency exit door while the aircraft was in flight.

Passengers aboard the flight, including a former mixed martial arts fighter, intervened to restrain the individual who was trying to open the plane's emergency exit door. The incident occurred while the aircraft was airborne, prompting the flight crew to divert to Miami International Airport.

The flight had originated in Puerto Rico and was bound for Chicago O'Hare International Airport when the disruption occurred. Aviation safety protocols require immediate response to any attempt to tamper with aircraft doors during flight, as such actions pose serious safety risks to all passengers and crew.

Frontier Airlines has not immediately released additional details about the incident or the condition of the passenger involved. The Federal Aviation Administration and local authorities typically investigate such incidents involving unruly passengers on commercial flights.

It was not immediately clear what charges, if any, the passenger might face or whether the flight later continued to its original destination in Chicago.