Don't get me wrong, I'm 100% behind the police. I think that they were very brave running after & getting so close to a man they thought was going to explode a bomb at any time! But, this time they did make a mistake. They assumed because he had a darker complexion he was from eastern decent & because he ran he was guilty. I'm sure they'll learn lessons from this.
I think the notice just verbalised what a lot of people were thinking, albeit with ironic humour, & surely it's best to talk about this rather than pretend it didn't happen.
They messed up & a family is now missing a son. But, next time something like this happens, and there will be a next time, I wouldn't want them to doubt themselves, I expect them to do their job. But like I said, I'm sure they've learned from this.