LogFAQs > #913806826

Full Throttle posted...

District Spokeseman Michael Lawrence said it happened Thursday morning at Lake Brantley High School as panic ensued when a Lake Brantley student shared the screenshot of the alert that teachers also received during the drill that warned of an active shooter on school grounds
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Principal Trent Daniel sent out an email that stating that a student was responsible for the "campus disruption caused by a social media post" and added that it is being investigated as a "disciplinary matter and all responsible parties will be disciplined"

What "disruption"?
Anyone at the school was already being told by the alert system that there was an active shooter, and not being told it was just a drill.
Anyone not at the school finding out about it via the social media post wouldn't arrive until the drill was over anyway.

Sounds more like the school is pissed that the student publicized the incident to world and brought the well-deserved embarrassment and condemnation on the school that it's now receiving.
And thus, they're going to try and punish the student. Who probably wasn't even trying to humiliate the school and legit thought s/he may be about to die and was sending the alert message out so loved ones could find out about it promptly.