On 17 March 1968 the worst violence for decades erupted in London during an anti-Vietnam demonstration.
Over 80,000 people thronged had thronged to Trafalgar Square for a peaceful protest against America’s involvement in Vietnam earlier in the day.
But a breakaway group clashed with police when it targeted the American embassy in Grosvenor Square.
Watch original footage from the protest in the British Pathe newsreel (above)
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