Dense fog had rolled into the area around the time the plane was approaching the airport. Visibility was at half a mile at 3:55 a.m. and had dropped to a quarter of a mile just after 4 a.m. in the area around Marine Corps Air Station Miramar, which is just a few miles north of the crash site, according to the National Weather Service.

Emergency personnel immediately responded to the scene, extinguishing multiple fires and assisting residents with evacuations, police said. At least a half-dozen people were on board the private jet at the time of the incident.