China has secretly built scores of massive new prison and internment camps in the past three years, dramatically escalating its campaign against Muslim minorities even as it publicly claimed the detainees had all been set free. The construction of these purpose-built, high-security camps -- some capable of housing tens of thousands of people -- signals a radical shift away from the country's previous makeshift use of public buildings, like schools and retirement homes, to a vast and permanent infrastructure for mass detention. Read the report here