Nobel laureate Malala Yousafzai condemned China's treatment of her fellow peace prize-winner Liu Xiaobo following his death of liver cancer in custody last week .

Liu, 61, was jailed for 11 years in 2009 for "inciting subversion of state power" after he helped write a petition known as "Charter 08" calling for sweeping political reforms in China.

Liu's incarceration meant he was unable to collect his Nobel Peace Prize in 2010, and he became the second winner of it to die in state custody, the first being Carl von Ossietzky in Germany in 1938. Liu's widow, Liu Xia, remains under effective house arrest.