U.S. Secretary of State Marco Rubio on Thursday condemned Thailand's return of at least 40 Uyghurs to China, where Washington says members of the Muslim group have faced genocide.

The secret deportation by Thailand of dozens of Uyghur men to China that has sparked international condemnation is a diplomatic win for Beijing and a snub to the United States and the United Nations,

Human rights groups warned that the Uyghurs, who were held in Bangkok for more than a decade, will face mistreatment from Chinese authorities back in Xinjiang.