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Tourists jump as their friends take photos on Tiananmen square in Beijing on June 4, 2013. Authorities launch a major push every June 4 to prevent discussion of the violently crushed 1989 pro-democracy protests, in which at least hundreds of people died.

Ed Jones/AFP

Tourists jump as their friends take photos on Tiananmen Square in Beijing on Tuesday. Authorities in China launch a major push every year on June 4 to prevent discussion of the 1989 pro-democracy protests that were violently crushed and in which hundreds of people died