A Chinese human rights activist whose husband was jailed earlier this year has disappeared and may have been taken by police to prevent her from speaking to journalists during the Beijing Olympics, an overseas-based human rights group said Friday. The group, Chinese Human Rights Defenders, said Zeng Jinyan disappeared on Thursday and has not been heard from. Zeng is married to activist Hu Jia, who was sentenced to 3 1/2 years in prison in April. "All attempts to contact her have failed. It is feared that Zeng has been taken into police custody and might be mistreated," the group said. "As the Olympics open in Beijing, it is believed that Zeng was taken away to ensure that no journalists will have access to her and that she will be unable to speak out about Hu Jia during the games," it said in a statement.