Although successful internationally, Huawei has faced difficulties in some markets, due to claims of undue state support, links to the People's Liberation Army, and cybersecurity concerns—primarily from the United States government—that Huawei's infrastructure equipment may enable surveillance by the Chinese government. With the development of 5G wireless networks, there have been calls from the U.S. and its allies to not do any kind of business with Huawei or other Chinese telecommunications companies such as ZTE. Huawei has argued that its products posed "no greater cybersecurity risk" than those of any other vendor and that there is no evidence of the U.S. espionage claims. Questions regarding Huawei's ownership and control as well as concerns regarding the extent of state support also remain. Huawei has also been accused of assisting in the surveillance and mass detention of Uyghurs in the Xinjiang re-education camps, which have resulted in sanctions by the United States Department of State. Huawei tested facial recognition AI capable of recognizing ethnicity-specific features to alert government authorities to members of the ethnic group.