China has launched a campaign to repatriate and interrogate Uighurs studying overseas, the latest draconian measure against the Muslim minority. More than 100 have been detained in Egypt after failing to obey Chinese demands to return, according to activists and fellow Uighur students. While the campaign has mainly targeted Uighurs studying in Muslim-majority countries, China has also pressed at least one student in the US to return. The repatriations appear to have been motivated by fears that Uighur students were being radicalised abroad, observers said.