Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. Rights Groups Urge China to End Enforced Disappearances Joyce Huang Marking the International Day of Victims of Enforced Disappearances on Aug.30,several human rights groups called on China to stop using the practice of disappearances to silence human rights defenders, dissidents and other members of civil society. They are urging the government in Beijing to immediately release those being held, including Yang Hengjun --an Australian writer of Chinese origin, whom Beijing has officially charged with espionage after a months-long detention. The former government official was detained in January as he prepared to head to Shanghai after traveling to Guangzhou from New York with family. He has been held without access to family or lawyers since then. Yang, who was later moved to Beijing, has been a vocal critic of Chinese authorities. Rights groups, including the International Service for Human Rights and Safeguard Defenders, called China's arrest of foreign citizens, including Yang and two Canadians, part of its aggressive "hostage diplomacy," according to a joint statement. Hostage diplomacy Some observers believe that Yang's incarceration may be linked to Australia's decision to ban the purchase of equipment from Chinese telecommunications giant Huawei over security concerns. Others, however, argued that Yang may be a target under China's campaigns to find double agents in politics or elsewhere. Yang was formerly a diplomat at China's foreign affairs ministry before working in the private sector in Hong Kong and moving to the United States and then Australia. Yang holds Australian citizenship. Once a visiting scholar at Columbia University in New York, the 54-year-old writer, known as the "democracy peddler," has been a popular political commentator. He has called for democratic reforms in China over the past decade. He is also famous for his spy thriller Fatal Weakness, which is one of three books in a series. Trade barbs During a recent interview with CNN, Australian Prime Minister Scott Morrison denounced the allegations against Yang as "absolutely untrue" and pledged to "stand up" for him. In response, China on Thursday criticized Morrison for what it called his "wanton" comments. .