A Dutch researcher says technology is being used to closely follow the movements of more than 2.5 million people in western China. Internet security researcher Victor Gevers recently released information about an operation in China’s far western Xinjiang area. Xinjiang is home to an ethnic minority population that is mostly Muslim. He said he discovered a database of information collected by a Chinese company on people in the area. Gevers is the co-founder of GDI Foundation, a Netherlands-based not-for-profit that finds and informs organizations of online security issues. The information included personal details like names, birthdates, places of employment and passport pictures. It also recorded real-time details such as the current position of individuals and places they had recently visited, Gevers said.