![Heavy security in China and Hong Kong on 35th anniversary of Tiananmen crackdown](https://npr.brightspotcdn.com/dims3/default/strip/false/crop/7371x5528+460+0/resize/7371x5528!/?url=http%3A%2F%2Fnpr-brightspot.s3.amazonaws.com%2Fc2%2Fc3%2F575e0cd7430786e7583e0bcc6cb6%2Fap24156101813910.jpg)
China has long quashed any memory of the killings, when the government ordered in the army to end the months-long protests and uphold Communist rule. The death toll remains unknown to this day.
(Image credit: Ng Han Guan)
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