Thailand's deportation of 40 Uyghurs to China last week was in the Southeast Asian country's best interest due to the possibility of retaliation from Beijing if the group was sent elsewhere, a Thai minister said on Thursday.

Dozens of Uyghur men detained in Thailand after fleeing China may have been secretly deported to their home country, activists and rights groups said on Thursday, warning they could face torture and imprisonment on their return.

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.

Canada and the United States offered to resettle 48 ethnic Uyghurs held in detention in Thailand over the past decade, sources told Reuters, but Bangkok took no action for fear of upsetting China, where they were covertly deported last week.

The US condemned "in the strongest possible terms" Thailand's return of 40 Uygur men to China on Thursday and called for Beijing to provide regular access to verify their well-being. "As Thailand's long-standing ally,

Rights groups criticized the Thai government for sending the Uyghurs, a persecuted Muslim minority, back to China, where they face the risk of torture and imprisonment.

Thailand acted in accordance with human rights when it sent 40 Uyghurs back to China last week, Prime Minister Paetongtarn Shinawatra told reporters on Monday.

Thai lawmakers, activists, and lawyers believe a group of Uyghur men detained in Thailand for more than a decade may have been deported to China early Thursday after trucks with covered windows were seen leaving a detention center and China said Chinese citizens had been repatriated from the Southeast Asian country.

The Thai government violated domestic and international law by forcibly sending at least 40 Uyghur men to China, where they could face torture, arbitrary detention, and long-term imprisonment.