This really is starting to look bad. So sad. I was working in London yesterday and the city was buzzing with the olympic news. You could here the cheer in from Trafalgar Square in Berkley square!
Terrorists I would say. But who: IRA? (outside bet at the moment) - G8 Anarchists? (timing would make sense, but not really their style) - Islamists (That's the gut reaction).
Please offer whatever prayers or vibes you can to our emergency services at these moments.