Investigators say six people aboard a private plane died when it crashed in a San Diego neighborhood in heavy fog.

The pilot of a small private plane that crashed in a residential neighborhood of San Diego earlier this week faced fog as he attempted to land, while runway lights and a weather alert system at the airport were not working,

San Diego County officials identified four of the jet’s six occupants killed in the crash and ensuing fire. One was 42-year-old music agent and certified pilot David Shapiro, who owned the company to which the Cessna 550 Citation II was registered.