"I need everyone to leave everything that you have in place – do not take anything out of here except for your bodies – I don’t wanna see any bags, books or anything."
Because who doesn't want to leave their $2K+ camera laying around for security goons to mess with. That said, when a potential bomb threat or other security issue has been called just leave the bag and get out of the room - your life isn't worth your belongings (even if 99% of the time stuff like this is just a false alarm).