Nobel Peace Prize winner Liu Xiaobo, a Chinese dissident imprisoned since 2009, has been released from confinement on medical parole, but his supporters are pressing for him to be allowed to seek treatment abroad for liver cancer.

Liu, who was awarded the Nobel Prize in absentia in 2010, was diagnosed with late-stage liver cancer on May 23, and is being treated at a hospital in the northeastern city of Shenyang, according to his lawyers and Chinese prison officials. Chinese law forbids any prisoner released on medical parole from traveling abroad, said Liu's lawyer, Mo Shaoping.

Calls Mount for 'Best' Treatment for Imprisoned Dissident Liu Xiaobo

"He cannot go and receive medical treatment in a hospital abroad that is not within the prison administration system," Mo told VOA.

Calls Mount for 'Best' Treatment for Imprisoned Dissident Liu Xiaobo

From Oslo, the said it was delighted to learn the 61-year-old dissident has been released from prison, but that the news from China came "with a mixture of relief and deep worry." The committee called for Liu's release "without conditions" and said he should be allowed to go abroad for treatment if he wishes.

Calls Mount for 'Best' Treatment for Imprisoned Dissident Liu Xiaobo

Senior officials at the U.S. State Department in Washington said they were working to gather more information about Liu's medical and legal status, but called on authorities in Beijing to allow Liu and his wife to seek medical treatment wherever they wish.

"We call on the Chinese authorities to not only to release Mr. Liu, but also to allow his wife, Ms. Liu Xia, out of house arrest, and provide them the protections and freedoms, such as freedom of movement and access to medical care of his choosing, to which they're entitled under China's constitution and legal system and international commitments," said Anna Richey-Allen, a spokeswoman for the State Department's East Asia and Pacific Bureau.

Liu's attorney Mo said there are multiple petition campaigns on the internet calling on the Chinese government to allow Liu to go abroad for treatment, even if that requires making an exception to customary legal procedures.

Another lawyer on Liu's team, Shang Baojun, told VOA that Liu's family has visited him at China Medical University Affiliated Hospital No. 1 in Shenyang, capital of Liaoning province, but it remains unclear whether his wife, Liu Xia, was allowed to see him. The dissident's legal team said she has not been heard from for some time.

The reported Liu was on medical parole and was being treated by eight cancer specialists, but gave no further details.

News of Liu's deteriorating health drew immediate and passionate reactions from his supporters and human-rights groups worldwide.

"The Chinese government's culpability for wrongfully imprisoning Liu Xiaobo is deepened by the fact that they released him only when he became gravely ill," Sophie Richardson, the China director at Human Rights Watch, said in a statement emailed to reporters.

"Liu Xiaobo has fought a relentless struggle in favor of democracy and human rights in China and has already paid a heavy price for his involvement," the Norwegian Nobel Committee said. "He was, essentially, convicted for exercising his freedom of speech and should never have been sentenced to jail in the first place.

"Chinese authorities carry a heavy responsibility," the Nobel committee said, "if Liu ... has been denied necessary medical treatment."

Chinese human-rights activist Hu Jia, a winner of the European Parliament's , told VOA that the long prison term handed down to Liu was a psychological and physical punishment akin to a politically motivated murder.

Hu, with Liu, was a cosigner of Charter 08, which called for reforming China's government.

The government "claimed Liu's condition was good … but suddenly states that he has terminal liver cancer," Hu noted. "What can I say? This is a kind of murder. A cold-blooded government regime is trying to escape its responsibility, so it declares medical parole."

He appealed to the government to allow Liu treatment at the best hospitals in Beijing.

"Nazi Germany didn't let a single Nobel Prize winner die in any Nazi prison," tweeted , a dissident journalist who was released from prison on medical parole in 2015 after being convicted of leaking state secrets.

"It's favoring Chinese communists to compare them with the Nazis," an anonymous netizen responded to Gao. "Because in front of Chinese communists, Nazis would be like angels."

Liu, imprisoned in 2009 for an 11-year term for advocating democracy, was unable to collect his Nobel Prize in Oslo in 2010, nor was his family allowed to collect it for him. He was represented at the ceremony by an empty chair.