This is not the first time this sought of incident as taken place. It happened not all that long ago, not far from where I live. I do believe the security guard/driver got the sack 'for not following procedures'.
Perhaps they should have sent for the 'A' Team :O)
I was in Harrogate 2 weeks ago and was walking past a security van making a delivery to a bank, when I was at the side of it a loud hailer started shouting "I am under attack call the police" Everybody was looking at me as though I was a criminal. It turned out to be the driver who was getting in the door on the other side, and had not switched the system off. Most disconcerting.
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