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People are seen gathered at Victoria Park during a candlelight vigil held to mark the 24th anniversary of the 1989 crackdown at Tiananmen Square, in Hong Kong on June 4, 2013. More than 100,000 people were expected to attend the candlelight vigil in the former British colony which is the only place in China where the brutal military intervention that ended weeks of nationwide democracy protests in 1989 is openly commemorated. PHILIPPE LOPEZ/AFP/Getty Images ( 520287907 )

Tens of thousands of people attend a candlelight vigil at Victoria Park in Hong Kong Tuesday June 4, 2013 to mark the 24th anniversary of the June 4th Chinese military crackdown on the pro-democracy movement in Beijing. (AP Photo/Kin Cheung) ( Hong Kong China Tiananmen Anniversary )

People take part in a candlelight vigil on the 24th anniversary of the Tiananmen Square protests during heavy rain on June 4, 2013 in Hong Kong, Hong Kong. Held to mark the crackdown on the pro-democracy movement in Beijing's Tiananmen Square on June 4, 1989.Pro-democracy groups hope to draw 150,000 people to the annual candlelight vigil in Hong Kong's Victoria Park, the only commemoration on Chinese soil. (Photo by Lam Yik Fei/Getty Images) ( 169904286 )

Tens of thousands of people attend a candlelight vigil under heavy rain at Hong Kong's Victoria Park in Hong Kong Tuesday June 4, 2013 to mark the 24th anniversary of the June 4th Chinese military crackdown on the pro-democracy movement in Beijing. (AP Photo/Vincent Yu) ( Hong Kong Taking Tiananmen )

People take part in a candlelight vigil held to mark the 24th anniversary of the 1989 crackdown at Tiananmen Square, in Hong Kong, on June 4, 2013. More than 100,000 people were expected to attend the candlelight vigil in the former British colony which is the only place in China where the brutal military intervention that ended weeks of nationwide democracy protests in 1989 is openly commemorated. ANTHONY WALLACE/AFP/Getty Images ( 520294216 )

Tens of thousands of people attend a candlelight vigil at Victoria Park in Hong Kong Tuesday June 4, 2013 to mark the 24th anniversary of the June 4th Chinese military crackdown on the pro-democracy movement in Beijing. (AP Photo/Vincent Yu) ( Hong Kong Taking Tiananmen )

A policeman stands beside his motorcycle at Tiananmen Square on a hazy day in Beijing June 4, 2013. Tuesday marks the 24th anniversary of a military crackdown on a pro-democracy movement at Beijing's Tiananmen Square. REUTERS/Petar Kujundzic ( CHINA/ )

Students hold candles before performing a song in a street leading to a candlelight vigil held to mark the 24th anniversary of the 1989 crackdown at Tiananmen Square, in Hong Kong on June 4, 2013. More than 100,000 people were expected to attend the candlelight vigil in the former British colony which is the only place in China where the brutal military intervention that ended weeks of nationwide democracy protests in 1989 is openly commemorated. PHILIPPE LOPEZ/AFP/Getty Images ( 520283817 )

Pedestrians get leaflets from activists in a street leading to a candlelight vigil held to mark the 24th anniversary of the 1989 crackdown at Tiananmen Square, in Hong Kong on June 4, 2013. More than 100,000 people were expected to attend the candlelight vigil in the former British colony which is the only place in China where the brutal military intervention that ended weeks of nationwide democracy protests in 1989 is openly commemorated. PHILIPPE LOPEZ/AFP/Getty Images ( 520283826 )

A plain-clothes policeman (L) follows suspected journalists 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/Getty Images ( 520281412 )

A chorus' members dressed in ethnic minority traditional costume visit the Tiananmen Square on June 4, 2013 in Beijing, China. (Photo by Feng Li/Getty Images) ( 169912042 )

A picture showing a man blocking a line of tanks during the 1989 pro-democracy movement in Beijing is displayed at Hong Kong's Victoria Park Tuesday, June 4, 2013. Tens of thousands of people were expected to gather Tuesday evening at Victoria park in the former British colony, holding candles aloft to remember those killed when their protests in central Beijing were crushed by the Chinese military on June 4, 1989. Commemorations of the crackdown are suppressed everywhere else in China. The writing at the bottom of the picture reads " Love the country start from the truth." (AP Photo/Vincent Yu) ( Hong Kong Taking Tiananmen )

Tens of thousands of people participate in a candlelight vigil at Hong Kong's Victoria Park June 4, 2013, to mark the 24th anniversary of the military crackdown of the pro-democracy movement at Beijing's Tiananmen Square in 1989. REUTERS/Tyrone Siu ( HONGKONG )

Tens of thousands of people take part in a candlelight vigil on the 24th anniversary of the Tiananmen Square protests during heavy rain on June 4, 2013 in Hong Kong, Hong Kong. Held to mark the crackdown on the pro-democracy movement in Beijing's Tiananmen Square on June 4, 1989.Pro-democracy groups hope to draw 150,000 people to the annual candlelight vigil in Hong Kong's Victoria Park, the only commemoration on Chinese soil. (Photo by Lam Yik Fei/Getty Images) ( 169901820 )

People take part in a candlelight vigil on the 24th anniversary of the Tiananmen Square protests during heavy rain on June 4, 2013 in Hong Kong, Hong Kong. Held to mark the crackdown on the pro-democracy movement in Beijing's Tiananmen Square on June 4, 1989.Pro-democracy groups hope to draw 150,000 people to the annual candlelight vigil in Hong Kong's Victoria Park, the only commemoration on Chinese soil. (Photo by Lam Yik Fei/Getty Images) ( 169904279 )

Activists wearing masks of China's jailed Nobel laureate Liu Xiaobo hold candles during a night vigil at Liberty Square in Taipei June 4, 2013, on the 24th anniversary of the June 4 crackdown on pro-democracy protesters at Tiananmen Square in Beijing. REUTERS/Steven Chen ( TAIWAN/ )

People take part in a candlelight vigil on the 24th anniversary of the Tiananmen Square protests during heavy rain on June 4, 2013 in Hong Kong, Hong Kong. Held to mark the crackdown on the pro-democracy movement in Beijing's Tiananmen Square on June 4, 1989.Pro-democracy groups hope to draw 150,000 people to the annual candlelight vigil in Hong Kong's Victoria Park, the only commemoration on Chinese soil. (Photo by Lam Yik Fei/Getty Images) ( 169904284 )

Students hold candles in heavy rain as tens of thousands of people attend a candlelight vigil at Hong Kong's Victoria Park Tuesday, June 4, 2013 to mark the 24th anniversary of the June 4th Chinese military crackdown on the pro-democracy movement in Beijing. (AP Photo/Vincent Yu) ( Hong Kong Taking Tiananmen )

A general view of the Tiananmen Square after sunset on June 4, 2013 in Beijing, China. (Photo by Feng Li/Getty Images) ( 169912103 )