It is standard practice in video productions to only record video in outdoor situations, then later add audio—car sounds, door closing sounds, foot fall sounds, etc.
This show how a typical “news” article is not news at all, rather just another work of fiction.
One of my favorites. Two reporters in the same parking lot, pretending to be apart and listening intently on their ear pieces.
Its all theater:
http://www.youtube.com/watch?v=fNMkfrs-z0M