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London to be protected from terror attack by new £5m 'ring of steel' built around the City | The Sun
Rings of Steel, Rings of Concrete and Rings of Confidence: Designing out Terrorism in Central London pre and post September 11th
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The Ring of Steel: A Walking Tour Around the City of London | UCL Urban Laboratory - UCL – University College London
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Harvard Design Magazine: Fortress London: The New US Embassy and the Rise of Counter-Terror Urbanism
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