Fans and world leaders express sorrow over Nobel laureate Liu Xiaobo's death
World leaders and human rights advocates expressed sorrow and anger over the death of Nobel Peace Prize laureate Liu Xiaobo, who died in police custody while being treated for advanced liver cancer in prison.
They also condemned the Chinese government for refusing the political prisoner's wish to travel overseas for treatment.
US Secretary of State Rex Tillerson was among those urging the Chinese government to release Mr Liu's wife from house arrest and to leave the country.
Mr Liu, 61, was a literary critic and writer who came to prominence in 1989 after he encouraged pro-democracy students to leave Beijing's Tiananmen Square rather than face down armed soldiers. Mr Liu was imprisoned four times, the most recently for co-writing a document circulated in 2008 that called for more freedom of expression, human rights and an independent judiciary in China.
He was in prison when the Norwegian Nobel Committee awarded him the Peace Prize in 2010 for his "long and non-violent struggle for fundamental human rights in China".
Renee Xia, international director of Chinese Human Rights Defenders, a network she said Mr Liu helped found, said the mood among her colleagues has been one of despair over his impending death and disappointment that leaders did not do more.
"When we spoke to each other people would start crying. There was this sense of, it was just a dark world,"she said. "Where are the moral leaders? Where are the values of human rights and human dignity and freedom?"
University of San Francisco law professor and immigrant rights' advocate Bill Ong Hing said it was tragic to lose such a widely-admired figure. Mr Hing's father immigrated to the US from China.
"The fact is he was not free to do and say and appear where he wanted. It's a stark reminder of the constraints that people in China have who are critical of the government," he said.
Former US president George W Bush praised Mr Liu in a statement, calling him a courageous man who "never wavered in his quest to advance freedom and democracy".
The White House said President Donald Trump was deeply saddened.
Press secretary Sean Spicer said in a brief statement: "The president's heartfelt condolences go out to Liu Xiaobo's wife, Liu Xia, and his family and friends. "
The United States had called on China's government to let the Nobel Peace Prize laureate and democracy activist seek medical care at a location of his choosing. But China considered such requests to be interference in its own affairs and considered Mr Liu a criminal.
Wang Dan, a prominent leader of the movement on Tiananmen Square, tweeted that governments worldwide must press for Liu Xia to be allowed to leave China, where she has been held under extralegal house arrest.
Wang wrote, "Xiaobo, my beloved teacher, my dear brother, you accepted too much hardship, rest easy."
Mr Tillerson urged China to let Liu Xia leave. He said her husband dedicated his life to improving China and humankind and to pursuing justice and liberty.
Suzanne Nossel, head of the US arm of the international literary and human rights organisation PEN International, faulted Chinese officials for not heeding calls to allow Mr Liu to travel abroad for medical treatment.
"China's refusal to honour Liu Xiaobo's last wish to travel overseas for treatment and its decision to hold him incommunicado during his dying days are a cruel epitaph in the tale of a powerful regime's determination to crush a brave man who dared challenge a government that sustains its rule through suppression and fear," Ms Nossel said.
Chinese authorities said the government made "all-out efforts" to treat Mr Liu and rejected foreign criticism of its handling of his illness.
In Hong Kong, prominent democracy activist Joshua Wong tweeted, "We will strive to carry forward his legacy to fight for democracy in HK and China."
Internationally acclaimed artist and activist Ai Weiwei tweeted: "Rest in peace. We are here, Xiaobo is here with us."