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[BeefontheBone]

Some guy on the radio said it might have been the work of "G8 protesters" - presumably he meant an anti-globalisation movement with terrorist leanings, rather than a few costumed hippies; that sounds about as likely as French militants upset that London's getting to host the Olympics. It seems to me that it's extremely well-coordinated, and therefore far more likely to be a large, established terrorist organisation like al-Qaeda or the Real IRA rather than a few anarchists.