The weather alert system and runway lights weren't working at a foggy San Diego airport where a private jet was planning to land before it crashed into a neighborhood, but the cause of the crash remains unclear to investigators,

A Cessna 550 crashed into a Murphy Canyon neighborhood just before 4 a.m. with an unknown number of people on board. Several home caught fire as an apparent result of the crash, leading to evacuations in the military housing neighborhood. Fire fighters are continuing to try to contain the blazes, with smoke visible from outside the neighborhood.

A Cessna aircraft crashed into a neighborhood in the Murphy Canyon area of San Diego. The only fatalities were the plane's occupants, authorities say.