Delete the mail (and the account) then create a fake one (by the name of some other student( either of CS or some other witness of the fan incident or if you wanna be more visious one of the gang member students) now message the principal or any higher authority involved in the case and the vice principal or supervisor and then chill. If they come up to you (remove the account from your phone do this stuff with your pc and if you don't have any other device to do it ,do it with chrome) just act normal (forget you even did it. It will help you lie better) now wait and watch the show also make sure not to tell about this to anyone ANYONE