1 of 7
Extra police were on duty in Beijing's Tiananmen Square for the 15th anniversary of the brutal, 4 June crackdown on China's 1989 pro-democracy protests

2 of 7
At least 16 people were arrested in the square as they tried to stage protests

3 of 7
Plain clothes policemen were also on the look-out

4 of 7
Tens of thousands of people were expected to gather in Hong Kong to commemorate the bloodshed

5 of 7
But for the majority in China, life continues as normal. Tiananmen Square serves predominantly as a tourist attraction

6 of 7
Many younger people have little idea of what happened 15 years ago, or follow the government's line that a "counter-revolution" was suppressed

7 of 7
For those who were involved or witnesses, the memories are indelible.