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Protestors clash with police during a march in Mexico City on the 40th anniversary of the Tlatelolco student massacre.

Remembering students killed in a massacre four decades ago, hundreds gathered at the site of the killings, Tlatelolco square and marched through the city streets.

In 1968 police stormed a student protest, killing scores of people. But rights activists and witnesses say that the death toll was around 300.

(Reuters.com October 4, 2008)