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In this May 16, 1989 file photo, medics rush a Beijing university student from Tiananmen Square after he collapsed on the third day of a hunger strike in Beijing. A quarter century after the Communist Party's attack on demonstrations centered on Tiananmen Square on June 4, 1989, the ruling party prohibits public discussion and 1989 is banned from textbooks and Chinese websites. (AP Photo/Sadayuki Mikami, File) ( China Tiananmen Then and Now )

A woman soldier sings among pro-democracy protesters occupying Beijing's Tiananmen Square, about June 2, 1989. Police and military would occasionally mixed with protesters in an attempt to keep the demonstration peaceful. In the early morning hours of June 4, 1989, soldiers overran the square, leaving hundreds dead overnight. (AP Photo/Jeff Widener) ( China Democracy Protests )

In this May 28, 1989 file photo, students rest in the litter of Tiananmen Square in Beijing, as their strike for government reform enters its third week. (AP Photo/Jeff Widener, File) ( China Tiananmen Then and Now )

A student from Beijing Normal University reads a pro-democracy statement to Chinese troops trapped by Beijing residents after being stopped on their way to Tiananmen Square in this June 3, 1989 photo. (AP Photo/Mark Avery) ( Tiananmen Square )

Civilians hold rocks as they stand on a government armored vehicle near Chang'an Boulevard in Beijing, early June 4, 1989. Violence escalated between pro-democracy protesters and Chinese troops, leaving hundreds dead overnight. (AP Photo/Jeff Widener) ( China Democracy Protests )

People Liberation Army (PLA) soldiers leap over a barrier on Tiananmen Square in central Beijing 04 June 1989 during heavy clashes with people and dissident students. (THOMAS CHENG/AFP/Getty Images) ( SAHK981103365510 )

Chinese residents check a burning armored personnel carrier which was set on fire by rioters fighting back when the army opened fire on the civilians on June 4, 1989 near Tiananmen Square in Beijing. On the night of 03 and 04 June 1989, Tiananmen Square sheltered the last pro-democracy supporters. A series of pro-democracy protests was sparked by the April 15 death of former communist party leader Hu Yaobang. In a show of force, China leaders vented their fury and frustration on student dissidents and their pro-democracy supporters. Several hundred people were killed and thousands wounded when soldiers moved on Tiananmen Square during a violent military crackdown ending six weeks of student demonstrations, known as the Beijing Spring movement. According to Amnesty International, five years after the crushing of the Chinese pro-democracy movement, "thousands" of prisoners remained in jail. TOMMY CHENG/AFP/Getty Images ( ARP2109583 )

This file photo taken on June 4, 1989 shows an armored personnel carrier in flames as students set it on fire near Tiananmen Square 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. Dissidents and human rights advocates around the world will mark on June 4, 2009 the twentieth anniversary of China's bloody crackdown on the pro-democracy protests. (TOMMY CHENG/AFP/Getty Images) ( Hkg2407944 )

Two injured during the clash between the army and students 04 June 1989 near Tiananmen Square are carried out by a cart. ( MANUEL CENETA/AFP/Getty Images) ( SAHK990531563190 )

Beijing residents inspect the interior of one of over 20 armored personnel carriers burned by demonstrators to prevent the troops from moving into Tiananmen Square 04 June 1989. (MANUEL CENETA/AFP/Getty Images) ( SAHK990531563140 )

The driver of an armored personnel carrier that rammed through student lines, injuring many, lies dead after being beaten by students who set his vehicle on fire during an army attack on Tiananmen Square in Beijing, China, June 4, 1989. (AP Photo/Jeff Widener) ( China Protests Tiananmen Square 1989 )

Taken care by others, an unidentified foreign journalist (2nd-r) is carried out from the clash site between the army and students 04 June 1989 near Tiananmen Square. (THOMAS CHENG/AFP/Getty Images) ( SAHK990527558420 )

Beijing residents inspect the interior of some of over 20 armored personnel carriers burned by demonstrators to prevent the troops from moving into Tiananmen Square 04 June 1989. (MANUEL CENETA/AFP/Getty Images) ( SAPA980724703120 )

In this June 5, 1989 photo, a Chinese man stands alone to block a line of tanks heading east on Beijing's Changan Blvd. from Tiananmen Square in Beijing. (AP Photo/Jeff Widener) ( China Tiananmen Then and Now )

Local residents loaded the wounded people on a rickshaw flatbed shortly after PLA soldiers opened fire on a crowd in this June 4, 1989 photo. (AP Photo/Liu Heung Shing) ( Tiananmen Square )

A rickshaw driver fiecely peddles the wounded people, with the help of bystanders, to a nearby hospital Sunday, June 4, 1989. PLA soldiers again fired hundreds of rounds towards angry crowds gathered outside Tiananmen Square at noon. (AP Photo/Liu Heung Shing) ( Tiananmen Square )

The bodies of dead civilians lie among mangled bicycles near Beijing's Tiananmen Square in this June 4, 1989 file photo. (AP Photo/File) ( China Hong Kong Tiananmen Crackdown )