Radio Free Asia (RFA) reported on October 28, 2016, that public security authorities in Changji city in Xinjiang have detained a man for using circumvention software to scale the complex system of blocks, filters, and human censorship known as the Great Firewall. Police said he had been detained this month for allegedly  "downloading violent and terrorist circumvention software" on October 13. Blog author and Internet activist Oiwan Lam blogged that "The leak raises serious questions about the consequences of using VPNs, web proxies, and other tools that help Internet users get around censorship and other obstacles (like slow speeds) in online networks." He said "It has been estimated that 1-3 percent of China's internet users use a circumvention tool to visit overseas websites."