More than 140 Nobel laureates led by archbishop Desmond Tutu urged China on Wednesday to release Nobel Peace Prize winner Liu Xiaobo, a rights activist jailed for subversion since 2009.

In a letter also signed by 400,000 people from more than 130 countries, the laureates called on China’s president-in-waiting Xi Jinping to release Liu and his wife Liu Xia, who has not been charged but is being held under house arrest.

The petition was being submitted to Chinese embassies and diplomatic missions in Hong Kong, New York, Paris, Berlin and London.

“This flagrant violation of the basic right to due process and free expression must be publicly and forcefully confronted by the international community,” archbishop Tutu, a fellow Peace laureate, said in the petition.

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