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Tens of thousands of people attend a candlelight vigil at Victoria Park in Hong Kong Wednesday, June 4, 2014, to mark the 25th anniversary of the June 4th Chinese military crackdown on the pro-democracy movement in Beijing. (AP Photo/Vincent Yu) ( Hong Kong Tiananmen Anniversary )

A woman holds a candle as tens of thousands of people attend a candlelight vigil at Victoria Park in Hong Kong Wednesday, June 4, 2014 to mark the 25th anniversary of the June 4th Chinese military crackdown on the pro-democracy movement in Beijing. (AP Photo/Kin Cheung) ( Hong Kong Tiananmen Anniversary )

Tens of thousands of people attend a candlelight vigil at Victoria Park in Hong Kong Wednesday, June 4, 2014 to mark the 25th anniversary of the June 4th Chinese military crackdown on the pro-democracy movement in Beijing. (AP Photo/Vincent Yu) ( Hong Kong Tiananmen Anniversary )

A Chinese man rests on a street near Tiananmen Square in Beijing, China, Wednesday, June 4, 2014. Beijing put additional police on the streets and detained government critics Tuesday as part of a security crackdown on the eve of the 25th anniversary of the crushing of pro-democracy protests centered on the capital's Tiananmen Square. (AP Photo/Ng Han Guan) ( China Daily Life )

Two Chinese tourists rest in Tiananmen Square on June 4, 2014 in Beijing, China. Twenty-five years ago on June 4, 1989 Chinese troops cracked down on pro-democracy protesters and in the clashes that followed scores were killed and injured. (Photo by Feng Li/Getty Images) ( 495534387 )

Chinese tourists wait for the customary ceremony of lowering flag in Tiananmen Square on June 4, 2014 in Beijing, China. Twenty-five years ago on June 4, 1989 Chinese troops cracked down on pro-democracy protesters and in the clashes that followed scores were killed and injured. (Photo by Feng Li/Getty Images) ( 495534389 )

A young man attends a candle lit vigil in Taipei, Taiwan, Wednesday, June 4, 2014, to mark the 25th anniversary of the June 4th Chinese military crackdown on the pro-democracy movement in Beijing. (AP Photo/Wally Santana) ( Taiwan Tiananmen Anniversary )

Chinese Paramilitary police officers salute each other as they stand guard below a portrait of the late leader Mao Zedong in Tiananmen Square on June 4, 2014 in Beijing, China. (Photo by Kevin Frayer/Getty Images) ( 495534893 )

Thousands of people crowd Victoria Park to mark the 25th anniversary of Tiananmen Square protests with a candle light vigil on June 4, 2014 in Hong Kong. In 1989 on June 4 students led a pro-democracy demonstration in Tiananmen Square, Beijing. The Chinese government brutally responded to stop it hurting and killing thousands of people. (Photo by Jessica Hromas/Getty Images) ( 495535409 )

A Chinese Paramilitary soldier stands guard under a portrait of the late leader Mao Zedong as tourists pass by in front of the Forbidden City at Tiananmen Square on June 4, 2014 in Beijing, China. (Photo by Kevin Frayer/Getty Images) ( 495552185 )

Tens of thousands of people attend a candlelight vigil at Victoria Park in Hong Kong Wednesday, June 4, 2014, to mark the 25th anniversary of the June 4th Chinese military crackdown on the pro-democracy movement in Beijing. (AP Photo/Kin Cheung) ( Hong Kong China Tiananmen Anniversary )

Tens of thousands of people attend a candlelight vigil at Victoria Park in Hong Kong Wednesday, June 4, 2014, to mark the 25th anniversary of the June 4th Chinese military crackdown on the pro-democracy movement in Beijing. (AP Photo/Kin Cheung) ( Hong Kong China Tiananmen Anniversary )

Tens of thousands of people attend a candlelight vigil at Victoria Park in Hong Kong Wednesday, June 4, 2014, to mark the 25th anniversary of the June 4th Chinese military crackdown on the pro-democracy movement in Beijing. (AP Photo/Cyrus Wong) ( Hong Kong Tiananmen Anniversary )

A woman holds a candle as she she joins tens of thousands of people attending a candlelight vigil at Victoria Park in Hong Kong Wednesday, June 4, 2014 to mark the 25th anniversary of the June 4th Chinese military crackdown on the pro-democracy movement in Beijing. (AP Photo/Kin Cheung) ( Hong Kong Tiananmen Anniversary )

Former Chinese student leader in the protests of 1989, Wu'er Kaixi speaks in front of a mock up Tiananmen Square back drop during a vigil in Taipei, Taiwan, Wednesday, June 4, 2014, to mark the 25th anniversary of the June 4th Chinese military crackdown on the pro-democracy movement in Beijing. (AP Photo/Wally Santana) ( Taiwan Tiananmen Anniversary )

Tens of thousands of people attend a candlelight vigil at Victoria Park in Hong Kong Wednesday June 4, 2014, to mark the 25th anniversary of the June 4th Chinese military crackdown on the pro-democracy movement in Beijing. (AP Photo/Kin Cheung) ( Hong Kong Tiananmen Anniversary )

Students address the crowd to commemorate China's 1989 Tiananmen Square events during a candlelight vigil in Hong Kong on June 4, 2014. Up to 200,000 people were set to take part in a candlelight vigil in Hong Kong on June 4 to commemorate the 25th anniversary of the bloody Tiananmen Square crackdown, as China seeks to wipe the incident from memory. AFP PHOTO / Philippe LOPEZ/AFP/Getty Images ( 530379144 )

Pro-democracy activists argue with police as they confront a pro-China group during a rally to mark the 1989 Tiananmen Square military crackdown, in Hong Kong on June 4, 2014. Thousands took part in a vigil in Hong Kong on June 4 to commemorate the 25th anniversary of the bloody Tiananmen Square crackdown, as China seeks to wipe the incident from memory. AFP PHOTO / ALEX Ogle/AFP/Getty Images ( 530380046 )

Pro-democracy activists hold a rally to mark the 1989 Tiananmen Square military crackdown, in the Tsim Sha Tsui area of Hong Kong on June 4, 2014. Thousands took part in a vigil in Hong Kong on June 4 to commemorate the 25th anniversary of the bloody Tiananmen Square crackdown, as China seeks to wipe the incident from memory. AFP PHOTO / ALEX Ogle/AFP/Getty Images ( 530380055 )

Pro-democracy activists shout at a pro-China group during a rally to mark the 1989 Tiananmen Square military crackdown, in Hong Kong on June 4, 2014. Thousands took part in a vigil in Hong Kong on June 4 to commemorate the 25th anniversary of the bloody Tiananmen Square crackdown, as China seeks to wipe the incident from memory. AFP PHOTO / ALEX Ogle/AFP/Getty Images ( 530380052 )

People sit together as they commemorate China's 1989 Tiananmen Square events during a candlelight vigil in Hong Kong on June 4, 2014. Up to 200,000 people were set to take part in a candlelight vigil in Hong Kong on June 4 to commemorate the 25th anniversary of the bloody Tiananmen Square crackdown, as China seeks to wipe the incident from memory. AFP PHOTO / Philippe LOPEZ/AFP/Getty Images ( 530380636 )

A girl holds a candle to commemorate China's 1989 Tiananmen Square events during a candlelight vigil in Hong Kong on June 4, 2014. Up to 200,000 people were set to take part in a candlelight vigil in Hong Kong on June 4 to commemorate the 25th anniversary of the bloody Tiananmen Square crackdown, as China seeks to wipe the incident from memory. AFP PHOTO / Philippe LOPEZ/AFP/Getty Images ( 530380645 )

A young woman reenacts the famous "Tank Man" scene from the 1989 Tiananmen Square military crackdown on pro-democracy protesters om Beijing, in front of a replica of a Chinese tank in Hong Kong on June 4, 2014. Up to 200,000 people were set to take part in a candlelight vigil in Hong Kong on June 4 to commemorate the 25th anniversary of the bloody Tiananmen Square crackdown, as China seeks to wipe the incident from memory. AFP PHOTO / ALEX Ogle/AFP/Getty Images ( 530378167 )