(DENVER, COLORADO) — Frontier Airlines Flight 4345 struck a pedestrian on runway 17L at Denver International Airport during takeoff late Friday, forcing the pilots to abort the departure, evacuate 231 souls on board and halt operations on the runway as federal investigators were notified.

The Airbus A321 was bound for Los Angeles International Airport when the incident occurred at approximately 11:19 p.m. local time on Friday, May 8, 2026. Air traffic control had cleared the flight for takeoff and wished the crew “a good night.”

About 30 seconds later, the pilot radioed the tower: “Tower, Frontier 4345, we’re stopping on the runway. Uh, we just hit somebody. we have an engine fire.” Asked how many people were aboard, the pilot replied, “231 souls on board” and added “there was an individual walking across the runway.”

Minutes later, the situation inside the aircraft worsened. “We’ve got smoke in the aircraft, we’re gonna evacuate on the runway,” the pilot said over air traffic control audio.

Denver International Airport said a brief engine fire broke out after the strike and Denver Fire Department crews extinguished it. Emergency crews responded at the scene and bused passengers back to the terminal after they left the aircraft.

Passengers and crew evacuated by inflatable slides onto the runway amid cabin smoke. Video recorded by passengers showed smoke inside the cabin and apparent blood on the engine.

Frontier said the aircraft carried 224 passengers and 7 crew members. The airline said no passengers or crew members suffered serious injuries, and one minor passenger injury was reported.

Denver International Airport said in a public statement: “Frontier Flight 4345 reported striking a pedestrian during takeoff at DEN at approximately 11:19 p.m. on Friday, May 8, 2026. There was a brief engine fire that was promptly extinguished by the Denver Fire Dept. Emergency crews responded to the scene and bussed passengers to the terminal. 231 souls were on board. Emergency response and investigation are ongoing. The NTSB has been notified. Runway 17L will remain closed while the investigation is conducted.”

Frontier described the sequence in its own statement, saying: “As flight 4345 was departing this evening from Denver International Airport to Los Angeles International Airport, the aircraft reportedly struck a pedestrian on the runway during takeoff. Smoke was reported in the cabin and the pilots aborted takeoff. Passengers were then safely evacuated via slides as a matter of precaution. The Airbus A321 was carrying 224 passengers and seven crew members. We are investigating this incident and gathering more information in coordination with the airport and other safety authorities. We are deeply saddened by this event.”

The National Transportation Safety Board is involved in the investigation. Airport officials said runway 17L remained closed as of May 9, 2026 while investigators worked the scene.

Authorities have not released the pedestrian’s identity. They also have not disclosed how the person accessed the runway, even as investigators began examining how someone reached an active departure surface at one of the country’s busiest airports.

The radio transmission from the cockpit captured the speed with which the emergency unfolded. The crew moved from a normal departure clearance to an aborted takeoff, a report of a person on the runway, an engine fire and smoke in the cabin in less than a minute.

That compressed sequence shaped the emergency response on the ground. Fire crews had to reach the aircraft, contain the engine fire and secure an evacuation area on the runway while passengers came down the slides in darkness near the disabled jet.

Runway closures at Denver International Airport can ripple across an operation built around multiple banks of departures and arrivals, and airport officials said the closure of 17L would stay in place during the investigation. Frontier said the flight to Los Angeles was rescheduled.

The incident placed three strands of inquiry before investigators at once: the presence of a pedestrian on the runway, the aircraft strike during takeoff, and the brief engine fire that followed. Federal and airport officials have said only that Frontier and Denver International Airport are coordinating with safety authorities.

By Saturday, the clearest public account still came from the cockpit and the official statements issued after the evacuation. A Frontier Airlines jet leaving Denver International Airport for Los Angeles aborted takeoff after the crew reported hitting “an individual walking across the runway,” then emptied onto the tarmac through its slides as smoke spread through the cabin and firefighters put out the engine fire.