"Air Exclusion Zone" is a common police term.
"Temporary Restricted Area" is the aviation term for same thing.
Not uncommon for one to be declared for aircraft crashes and other major incidents, particularly where fatalities are involved. Helicopter downwash can disturb evidence and present a hazard - particularly biohazard - to the ground parties, aside from the annoyance presented to them doing a difficult job.
If the media have half decent lenses on their cameras, the small area should not present an issue.
Edit: Per ERSA, Leigh Creek has very specific requirements for night VFR ops.