“If you exceeded two minutes in the toilet, they hit our heads with an electric prod,” Gulzira, who was detained for 17 months, tells FRONTLINE. Subscribe on YouTube: bit.ly/1BycsJW An estimated two million Uyghur and other Muslims have been detained without trial by China’s government over the past three years, in what has been described as the largest mass incarceration of an ethnic group since the Holocaust. Two Kazakh Muslim women who were held in China's detention camps speak out in the FRONTLINE documentary "China Undercover," offering rare firsthand accounts of life inside the camps. “You were like a zombie in the camp, like someone who had lost their mind,” Rahima, who was held for a year and recalls being beaten and shouted at, tells FRONTLINE in the above clip. “You just think about being released and dream of that moment.” Watch "China Undercover" starting April 7: to.pbs.org/3e10JMr China’s government says that “requirements on respecting and safeguarding human rights are strictly followed, the dignity of the trainees are fully respected, and insults and cruelties of any form are strictly prohibited” — and that it has now released everyone being detained in the camps. But as "China Undercover" explores, family members of believed to have been held in the detention camps are still waiting to be reunited with their loved ones. Instagram: www.instagram.com/frontlinepbs Twitter: twitter.com/frontlinepbs Facebook: www.facebook.com/frontline FRONTLINE is streaming more than 200 documentaries online, for free, here: to.pbs.org/hxRvQP Funding for FRONTLINE is provided through the support of PBS viewers and by the Corporation for Public Broadcasting. Major funding for FRONTLINE is provided by the John D. and Catherine T. MacArthur Foundation and the Ford Foundation. Additional funding is provided by the Abrams Foundation, the Park Foundation, The John and Helen Glessner Family Trust, and the FRONTLINE Journalism Fund with major support from Jon and Jo Ann Hagler on behalf of the Jon L. Hagler Foundation.