My suggestion for a flying school would be to have a pre-written release available that can be tweaked, printed, then handed or faxed (not Emailed) to journalists if something has gone badly wrong.
I'd word it along the following lines:
(Organisation) confirms that an accident has occurred to its (type) aircraft, registration (reg) on (date).
Emergency services have attended the scene, and NTSB/AAIB/whoever have been notified and will be investigating the accident. (Organisation) are already in contact with (accident investigation organisation) and will be giving our full co-operation.
The nature and outcome of the accident is not yet certain, but as information becomes available it will be important that those most directly affected are informed first of all. For this reason we regret that we cannot provide more information at this time, but as it becomes available and we have first informed those directly affected, we will publish verified information on our website at ***.***.***.
In the meantime, we must concentrate upon supporting those affected by this accident, and assisting the official investigation so please ask that those not directly affected, including the press, respect this.
(Organisation) is a flying school based at (airport) where it has operated since (year), we are approved by the FAA/CAA/whoever to (very brief list of activities). We operate a fleet of (types and numbers) and pride ourselves on an excellent safety record throughout our operations to date.
G