It's a Bird, It's A Plane, It's A Boom ?

On Friday my school experience a boom threat. Of course the principal came over the intercom and inform the students it was a drill. The administration,faculty and staff knew it was a real boom threat. Well the school took the necessary precautions to ensure the safety for the everyone. After about 45minutes we were cleared to go back inside the building. After 10 minutes I had a knock at my door. It was my guess speaker I had invited a week ago. My guess was the 911 Director. I had completely forgot about him but I guess it was perfect timing for him to explain the challenges,danger,false call,etc.