It has been 25 years since massive protests in Beijing and other Chinese cities, and China's crackdown on the pro-democracy demonstrations in Tiananmen Square.
The Crackdown in Tiananmen Square

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A man tries to pull a Chinese soldier away from his comrades as thousands of Beijing citizens turned out to block thousands of troops on their way towards Tiananmen Square, June 3, 1989.

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A military helicopter drops leaflets above Tiananmen Square, May 22, 1989.

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Beijing University students wave fists and flags as Chinese military helicopters fly over Tiananmen Square, May 21, 1989.

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Communist Party General Secretary Zhao Ziyang speaks with fasting university students in Beijing's Tiananmen Square, May 19, 1989.