“I am worried about their safety,” he said. “I hope they can safely come to be at my side as soon as possible, and our family can reunite.”

Belgium’s decision to dispatch a diplomat to Xinjiang comes as the embassy faces criticism for allegedly enabling Chinese police to take the family back to Xinjiang.

“The case exposes the additional risk Uygurs in China face even if they want to seek help from foreign governments,” said Patrick Poon, China researcher at Amnesty International.

“The Belgian embassy set an extremely bad example of how governments put economic interests above human rights.”

China’s foreign ministry and the Xinjiang government did not immediately respond to requests for comment.

The mother, Horiyat Abdulla, and her four children travelled to Beijing at the end of May to complete missing paperwork for their family reunification visas.

According to Tursun, his wife and children panicked upon learning it would take “at least three months” for their visas to be approved and refused to leave the embassy.

They were afraid to return to their hotel because police had visited them multiple times since they arrived in Beijing, he explained.

Beijing sees ‘broad consensus’ with UN on Xinjiang as human rights groups blast envoy’s visit

“The police came in the middle of the night, asking why they came to Beijing, when they would return,” he said. “They were very scared, they didn’t sleep all night.”

The embassy offered to accompany Abdulla and her four children back to their hotel, but they “refused to leave the embassy in a kind of sit-in”, a Belgian ministry spokesman said.

In an interview published on Tuesday, Belgian Foreign Minister Didier Reynders told Le Soir newspaper that the diplomatic police “asked the family to leave the premises” and the situation was explained to the father the next day.

An embassy is not intended to “lodge people” applying for visas, he said.

In the end, Chinese police “escorted them away”, the Belgian ministry spokesman said.

A few days later, Abdulla and her children were taken away by Xinjiang police, her husband said, and he had not heard from her since.

Reynders told the Belga news agency on Monday that the diplomat would go to the address given by the father to check if “everything is going well” with them.

“My only concern here is that we can reunite the family,” he told Belga.

On Monday the foreign ministry did not have confirmation that they were at home.

According to human rights groups, authorities in Xinjiang have confiscated passports of Uygurs, making it difficult for them to join their relatives overseas.

Abdulla and her children, too, have struggled to obtain passports – an issue that Belgium’s ambassador would take up with China’s director of consular affairs, Reynders told Belga.

Abdulla applied for a passport in 2017, but never received one, according to receipts seen by AFP.

Tursun believes that the family “took a risk” by travelling outside Xinjiang in the first place.

“If my family then returns to [Xinjiang’s capital] Urumqi, it’s very likely that they will be sent to a concentration camp,” he wrote in March in an email to a non-profit helping the family with their visa application.