Turning point in US anti-war movement
Forty years ago National Guard troops in the US state of Ohio fired on students who were protesting against the Vietnam war at Kent State university.
Four students were killed that day, piercing the conscience of people across the country.
It became a defining moment for the US anti-war movement.
Al Jazeeras Nick Spicer looks at what the events of Kent State mean for today (4 May 2010).
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