TOKYO (Reuters) - Nearly 10,000 Uighurs involved in deadly riots in Chinas northwestern Xinjiang region went missing in one night, exiled Uighur activist Rebiya Kadeer said on Wednesday, calling for an international investigation. Kadeers visit to Tokyo was condemned by China. The vice-foreign minister summoned the Japanese ambassador in Beijing to express China strong dissatisfaction, the Foreign Ministry said. In Xinjiangs worst ethnic violence in decades, Uighurs on July 5 attacked Han Chinese in the regional capital of Urumqi after police tried to break up a protest against fatal attacks on Uighur workers at a factory in south China. Nearly 10,000 (Uighur) people who were at the protest, they disappeared from Urumqi in one night, Kadeer told a news conference in Tokyo through an interpreter. If they are dead, where are their bodies? If they are detained, where are they? She called on the international community to send an independent investigative team to Urumqi to uncover details of what had taken place. The official death toll from the riots stands at 197, most of whom were Han Chinese who form the majority of Chinas 1.3 billion population. Almost all the others were Uighurs, a Muslim people native to Xinjiang and culturally tied to Central Asia and Turkey. More than 1,000 people were detained in the immediate aftermath of the riots, and over 200 more in recent days, state media said. None has been publicly charged.