Although it was public, 99.99% of people would not know what this photo means. They would not even know who exactly these people are. They just ignored it as an innocent picture. It is the job of an intelligence analyst to give such an object meaning. A picture says a thousand words.
By the way, as I had correctly predicted they quite quickly found the bank manager unharmed but with no money or weapon !! Bank robbers usually never kidnap anyone once they have the money. There is no value in it. It was staged to fool naive people.