GENEVA, Dec 10 (Reuters) - The United Nations" human rights office is finalising its assessment of the situation in China"s Xinjiang region, where Uyghurs are alleged to have been unlawfully detained, mistreated and forced to work, a spokesperson said on Friday. Rupert Colville said that the office of U.N. High Commissioner for Human Rights Michelle Bachelet hoped to publish its report in the coming weeks and that there had been "no concrete progress" in long-running talks with Chinese officials on a proposed visit. Earlier on Friday, an unofficial British-based tribunal of lawyers and campaigners said Chinese President Xi Jinping bore primary responsibility for what it said was genocide, crimes against humanity and torture of Uyghurs and members of other minorities in the Xinjiang region. China dismissed the tribunal, which has no powers of sanction or enforcement, as a "farce". read more "The Uyghurs tribunal has brought to light more information that is deeply disturbing in relation to the treatment of Uyghurs and other Muslim ethnic minorities in Xinjiang," Colville told a U.N. briefing in Geneva. "We have of course similarly identified patterns of arbitrary detention and ill-treatment in institutions, coercive labour practices and erosion of social and cultural rights in general," he said. There was no immediate response from China"s mission to the U.N. in Geneva to a request for comment. China has previously said Western powers sought to denigrate its reputation by inventing problems in Xinjiang where people lived in harmony. In June, Bachelet publicly suggested a timeline for a visit, which she has been negotiating the terms of since Sept. 2018. Her findings need to be shared with the Beijing government before they could be made public, Colville said, adding he hoped that would in be a matter of weeks. Asked about diplomatic boycotts of the Beijing Winter Olympics in February, announced by the United States, Australia, Britain and Canada, Colville declined comment saying: "I don"t think it would be really fruitful for us to get into that".