I used to get very annoyed by this announcement that seems to blast from the terminal intercoms every 5 minutes while sitting at the airport.  I got to witness what happens when you leave a bag unattended, it is pretty serious, and involves many levels of airport security to handle the situation.  I do not know how this dude was just walking and decided to leave his roller luggage standing upright but he is probably wishing he didn’t right now.  

Here is a sequence of events to explain the situation.

first check the tags

Call in some  important people

Call in some more important people