Uighurs and members of other Chinese ethnic minorities living in exile have formed a group in Japan to campaign for improvements in human rights in China.
About 100 people, including 10 members of Uighurs, Tibetans and other ethnic minorities, gathered on Friday for the founding of the group in Tokyo.
Rebiya Kadeer, who headed the World Uyghur Congress and now lives in exile in the United States, is acting as representative.
She said many Uighurs in China are oppressed on religious grounds and forced into concentration camps. She said it's a matter of concern not only for Uighurs, but for the international community.
Reports by an international human rights watchdog and a US Congressional panel say authorities have been rounding up Uighur Muslims in the Xinjiang Uygur Autonomous Region under the pretext of anti-terror measures.
Roughly one million people are reportedly being held in detention, where they are subjected to abuse and ideological education.
The group is demanding the Japanese government lodge a protest with China. The group says it has asked Prime Minister Shinzo Abe to call on the Chinese government to release Uighurs from concentration camps.