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China - Still from Reuters video of lone protester in front of a line of tanks on Tiananmen Square. from June 5, 1989. 05Jun1989 - China - Still from Reuters video of lone protester in front of a line of tanks on Tiananmen Square. from June 5, 1989. 05Jun1989

China -- Tanks and soldiers guard the strategic Chang'an Avenue leading to Tiananmen Square two days after their crackdown on pro-democracy students, Beijing, 06Jun1989 - CHINA, Beijing : (FILES) This file photo taken on June 6, 1989 shows People's Liberation Army (PLA) tanks and soldiers guarding the strategic Chang'an Avenue leading to Tiananmen Square in Beijing two days after their crackdown on pro-democracy students. Hundreds, possibly thousands, of protesters were killed by China's military on June 3 and 4, 1989, as communist leaders ordered an end to six weeks of unprecedented democracy protests in the heart of the Chinese capital.

China -- A girl wounded during the clash between the army and students is carried out by a cart, Beijing, 04Jun2009 - CHINA, Beijing : (FILES) This file photo taken on June 4, 1989 shows a girl wounded during the clash between the army and students near Tiananmen Square in Beijing being carried out by a cart. Hundreds, possibly thousands, of protesters were killed by China's military on June 3 and 4, 1989, as communist leaders ordered an end to six weeks of unprecedented democracy protests in the heart of the Chinese capital.

China -- Hundreds of thousands of protesters gather on Tiananmen Square in Beijing, 02Jun1989 - CHINA, Beijing : (FILES) This file photo taken on June 2, 1989 shows hundreds of thousands of Chinese gathering around a 10-metre replica of the Statue of Liberty (C), called the Goddess of Democracy, in Tiananmen Square demanding democracy despite martial law in Beijing. Hundreds, possibly thousands, of protesters were killed by China's military on June 3 and 4, 1989, as communist leaders ordered an end to six weeks of unprecedented democracy protests in the heart of the Chinese capital.

China - Soldiers from the Peoples Liberation Army (PLA) stand guard on Tiananmen Square in Beijing, 03Jun2009 - Caption: epa01749549 Soldiers from the Peoples Liberation Army (PLA) stand guard on Tiananmen Square in Beijing, China 03 June 2009. Security is extremely tight as tens of thousands of uniformed and plainclothes personnel are deployed all over the Chinese capital on the eve of the sensitive 20th anniversary of the 1989 June 4th violent suppression of pro democracy demonstrators. EPA/ADRIAN BRADSHAW

China - A policemen tries to stop a journalist from taking photos outside Tiananmen Square in Beijing, 04Jun2009 - Caption: epa01750548 A policemen tries to stop a journalist from taking photos outside Tiananmen Square in Beijing, China, early 04 June 2009. As June 04 marks the 20-year-anniversary of the 1989 Tiananmen Square military crackdown authorities have raised the security level in that area to a maximum and denied access for western journalists. EPA/OLIVER WEIKEN

China - A plainclothes policeman keeps watch on Tiananmen Square at sunrise in Beijing, 04Jun2009 - Hkg2441001 Object name CHINA - POLITICS - RIGHTS - TIANANMEN - ANNIVERSARY CHINA, Beijing : A plainclothes policeman keeps watch on Tiananmen Square at sunrise in Beijing on June 4, 2009. Foreign media were harassed and barred as China kept Tiananmen Square under tight surveillance for the 20th anniversary of its crackdown on pro-democracy protesters -- a subject that is taboo here but still captures global attention. AFP PHOTO/Peter PARKS

China -- People use computers at an internet cafe in Beijing, 06Jun2009 - CHINA, Beijing : TO GO WITH AFP STORY "China-Internet-crime-police-politics," People use computers at an internet bar in Beijing on June 3, 2009.

China - Bao Pu, editor of the secret diaries of former Chinese leader Zhao Ziyang who was ousted from power during the Tiananmen protests, speaks at a Foreign Correspondents' Club luncheon in Hong Kong, 04Jun2009 - Hkg2441281 Object name HONG KONG - CHINA - POLITICS - RIGHTS - TIANANMEN - ANNIVERSARY CHINA, Hong Kong : Bao Pu, editor of the secret diaries of former Chinese leader Zhao Ziyang who was ousted from power during the Tiananmen protests, speaks at a Foreign Correspondents' Club luncheon in Hong Kong on June 4, 2009. June 4th marks the 20th anniversary of Beijing's crackdown on the pro-democracy protests. AFP PHOTO / MIKE CLARKE

China -- A plain cloth policemen adjusts a camera at the entrance of Tiananmen Square in Beijing, 04Jun2009 - Caption: epa01750553 A plain cloth policemen adjusts a camera at the entrance of Tiananmen Square in Beijing, China, early 04 June 2009. As June 04 marks the 20-year-anniversary of the 1989 Tiananmen Square military crackdown authorities have raised the security level in that area to a maximum and denied access for western journalists

China - A plain cloth policemen tries to stop a journalist from taking pictures outside Tiananmen Square in Beijing, 04Jun2009 - Caption: epa01750550 A plain cloth policemen tries to stop a journalist from taking pictures outside Tiananmen Square in Beijing, China, early 04 June 2009. As June 04 marks the 20-year-anniversary of the 1989 Tiananmen Square military crackdown authorities have raised the security level in that area to a maximum and denied access for western journalists. EPA/OLIVER WEIKEN