As regard to the Jakarta bombing, the white van just drove into
the driveway and exploded immediately... there was nothing the guy
watching the CCTV do except call for an ambulance and tell the
police it was a bomb.
CCTV is there placed to provide tipoffs of suspicious characters...
ie its possible that the white van has driven pass the drive way of
the hotel lobby a few days before the bombing, stopped and dropped
off the suspect when they were doing their dry runs or inspecting
which spot would inflict the maximum damage. Its possible that
during the bombing, there was a key man in the lobby, waiting for
some VIP to come out to the lobby and signalling for the van to
come up?