I think it was done by bad guys and good guys sabotaged guidance or shot down missile.
Nonetheless, possibility it was good guys is very strong. Why?
Assuming (yes, I know):
HRC/WJC, Huma & child? on Hawaii.
Alert test was planned, but dipshit admin had doxxed password on a stick-it note in an earlier photo shoot, so it was child's play to hack this particular alert to live conditions.
Freak out happens, Clintons and associated 'persons of interest' immediately bolt to, until then, unknown bunkers.
Maybe a tie in with all the underground explosions elsewhere.
Threaten the rabbits and watch which holes they dive in to?