Sometimes an event can only be described with a dose of profanity. Tim Worstall offers the default British reaction to today's outrage:

Yes, we’ll take an excuse for a day off, throw a sickie. But you threaten us, try to kill us? Kill and injure some of us?

Fuck you, sunshine.

We’ll not be having that.

No grand demonstrations, few warlike chants, a desire for revenge, of course, but the reaction of the average man and woman in the street? Yes, you’ve tried it now bugger off. We’re not scared, no, you won’t change us. Even if we are scared, you can still bugger off.
Terrorist Bombs in London