None of the four people — two pilots and two crew chiefs — on board the UH-1Y helicopter were injured, according to Maj. Alex Lim, a spokesman with the 3rd Marine Aircraft Wing.
The helicopter made its emergency landing around 3:30 p.m., Lim said, though it was not immediately clear what issue prompted the landing, or where exactly in the state nature preserve it happened.
Witness video provided to NBC7 appeared to show the helicopter landing in the area of Los Peñasquitos Lagoon, just east of Torrey Pines Road and Torrey Pines State Beach and southwest of Carmel Valley Road.
Lim said most of the 3rd Marine Aircraft Wing is based at Marine Corps Air Station Miramar, but the helicopter involved in Monday's incident was part of a group based at Marine Corps Base Camp Pendleton.
It was not immediately clear how Marine Corps officials planned to get the aircraft — a midsize, twin-engine utility helicopter — back to Camp Pendleton, but Lim said attempts would likely be made to fix any issues at the landing site in order to fly it back to its base.
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