Detained rights activist Yao Lifa returned home briefly at the weekend but his wife was unsure of his whereabouts after he left home for work yesterday. Yao, 53, a primary school teacher and activist in Qianjiang , Hubei , was taken away on June 20 and did not return home until late on Sunday - more than 10 weeks after going into detention. His wife, Feng Ling, said she suspected Yao's detention was meant to stop his campaigning for district-level elections during the summer holiday. He won a seat as an independent candidate in a local people's congress election in Qianjiang in 1999. Feng said Yao suffered stomach pain while in detention on Friday and was sent to a nearby hospital. He was diagnosed with an inflamed gall bladder and discharged two days later. But early yesterday morning, about a dozen men went to their home asking Yao to go back to the school where he worked. Feng said Yao called her later saying that he would not be able to return home for lunch. Feng said that two weeks after he was detained, on July 4, Yao managed to escape by leaping from the second floor of the place where he was confined, but hurt his back. He had gone into hiding until he was seized at a friend's house in Beijing on the morning of August 6 by plain-clothes security police. Yao was transferred to a hostel at the Jianghan oilfield in Qianjiang. Feng said Yao was still suffering from compression fractures of his spine but was not allowed to be treated by doctors or transferred to a hospital. Feng said that Yao had lost more than 10 kilograms in two months because he was fed only twice a day, with each meal a third of a normal portion. He was not allowed to read books or watch television and was under surveillance 24 hours a day. 'I am extremely concerned about his health because it seems to me that they won't let him receive proper treatment,' she said. 'It's too inhumane.' Feng's phone was disconnected yesterday afternoon.