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,

In the stillness of night, a quiet, tree-lined street in a San Diego neighborhood was plunged into chaos when a plane clipped a power line and crashed – turning cars into fireballs and sending residents fleeing in a haze of smoke and confusion.