There is no accurate figure of the number of ethnic Uygurs who have gone to fight with militant groups in Syria, China’s special envoy for the Syrian issue said on Monday, adding that he hoped to return to Syria to gain a clearer picture. China is worried that Uygurs, a mostly Muslim people who speak a Turkic language and hail from China’s far western region of Xinjiang Uygur autonomous region, have gone to Syria and Iraq to fight for militants, having travelled illegally via Southeast Asia and Turkey. The Syrian ambassador to China told Reuters last year that up to 5,000 Uygurs were fighting in various militant groups in Syria. Islamic State claimed responsibility for the killing of a Chinese hostage in 2015, highlighting China’s concern about Uygurs it says are fighting in the Middle East and its fears they may return to China to carry out attacks. Envoy Xie Xiaoyan said in Beijing that China talked with all countries, including Syria, about the fight against terror. “As for how many Uygur terrorists there are, I’ve seen all sorts of figures – some say 1,000 or 2,000, 2,000 or 3,000, 4,000 or 5,000, and some say even more,” Xie said after a visit to Syria, Saudi Arabia and Israel last month. “I hope that next time I have the opportunity to go to Idlib to have a look,” he added, referring to the last big swathe of territory still held by Syrian rebels. UN says it has reports that China is holding 1 million Uygurs in ‘secret internment camps’ Idlib is controlled by an array of insurgent groups, with Sunni Muslim jihadists believed to be the dominant force there. China has blamed a group called the East Turkestan Islamic Movement, or ETIM, for many of the attacks in recent years in Xinjiang, though some experts have questioned whether the group exists in any coherent form. Xie cited a United Nations report that there were 20,000 or 30,000 people fighting with terror groups in Syria and Iraq. Inside the camps where China tries to brainwash Muslims until they love the party and hate their own culture “Certainly in those areas there is rather a concentration of ETIM terrorists – this is certain,” he said. It is not possible to independently verify the number of Uygurs in Syria or Iraq. Rights groups and Uygur exiles say many Uygurs have fled to Turkey simply to escape Chinese repression at home, accusations Beijing denies. Xinjiang is a highly sensitive issue for China. Earlier this month, a United Nations human rights panel said it had received many credible reports that 1 million Uygurs in China were held in what resembled a “massive internment camp”. China has accused “anti-China” forces of being behind the criticism of its record and policies in Xinjiang.