Uighurs from China's Xinjiang are being given Turkish identity papers in Southeast Asia by Turkish diplomats and then taken to Turkey where some are sold to fight for groups such as the Islamic State as "cannon fodder," a senior Chinese official said Saturday.

Beijing says the Turkic language-speaking Uighur minority are firstly Chinese nationals, and those who flee China should be returned to their home region in the far west of the country bordering central Asia.

"Turkish embassies in Southeast Asia will give them proof of identity," Tong Bishan, division chief of the Ministry of Public Security's Criminal Investigation Department, told a small group of foreign reporters in Beijing.