thwey've just had a communications wallah on the news saying somehting along the lines of what I was suggesting. Social media spread stuff quickly, and the best way to calm things is to tell the truth asap. People in the tube station just got a pre-recorded announcement telling everyone to leave the platforms; a better approach would have been a specific announcement saying "there's been a fight on platform X, we ask passengers to move to Y while it's sorted out." As it was, rumours flew around and were duly tweeted and retweeted and half the street had to be shut down.
It seems the two men have handed themselves in. But other things that need to be investigated (not with an eye to blaming or proscecuting) is where the claims of gunshots came from), where the problem was supposed to be, and so on. A lot of time and effort was wasted, but it ought to be a useful learning exercise about not turning a drama into a crisis.