A viral video showing a young black student in the US thrown to the ground in class by a school officer has prompted outrage across the country and the world.
The deputy in the video has since been fired, but the incident has again reignited calls for the country to combat police violence toward black Americans.
At the forefront of the calls is the Black Lives Matter movement, which started in 2013 to demand action and draw attention to what it calls police bias and institutionalised racism.
So, do black lives matter in the US? And also, is institutional racism a problem across the world?
In this week's Arena, Mehdi Hasan speaks to DeRay McKesson, one of the leading voices of the movement.
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Source: Al Jazeera