Wife of the prominent Chinese political dissident Gao Zhisheng says her husband has been out of contact for three days after he voiced support for a fellow activist who was sentenced to prison last week.

Gao, a rights lawyer who defended members of the banned Falun Gong spiritual movement and alleged Chinese authorities tortured him while in detention, has been under tight surveillance since his release from jail in the summer of 2014. His latest disappearance could indicate he is being punished for again speaking out.

Geng He, who lives in the United States, said Wednesday that her daily contact with Gao was severed Sunday and that later calls yielded a message that his number no longer existed.

Gao praised fellow activist Yang Maodong in an online article dated Saturday.