Easy solution: Prosecute the students (since it is known who was given the keys to the school) and fire the principal who let them go in after hours without supervision.
Um, unless the perps and the principal are from a protected race (which the kids appear to be), so never mind….
“Easy solution: Prosecute the students ...”
There is no investigation because the school hasn’t even FILED A POLICE REPORT.
The yutes will skate.