The earlier debate about the value of having the runways and general airport area monitored by cameras was deflected by news that the investigators were studying video of the crash. Can anyone enlighten us whether what we are talking about is:
a) amateur or plane spotter video,
b) CCTV cameras designed for passenger or road traffic surveillance that “caught” the crash by accident, or
c) Cameras installed by the airport specifically to monitor take-offs and landings for safety or flight operations performance that we haven't yet been told about.