Security is tight in the Chinese capital of Beijing Thursday as China celebrates 60 years of Communist rule with a massive military parade and an elaborate fireworks display.
On 4 June 1989 the Chinese military crushed the protest gathered in Tiananmen Square. 20 years later, that day's events are still a taboo subject in China. Our correspondents investigate how much the current generation knows about it.
China imposed a security clampdown Thursday to prevent any event marking the 20th anniversary of the Tiananmen pro-democracy uprising, as Beijing faced renewed calls to account for its repressive response to the 1989 protests.
US Secretary of State Hillary Clinton has urged China to release the names of those killed in the Tiananmen Square protests in rare public criticism ahead of the 20th anniversary of the 1989 military crackdown.
Tiananmen 
