An MSNBC news producer has been mocked online after he published a tweet last Sunday that used the word "alleged" when referring to China's human rights abuses against Uyghur Muslims.

"Japan has decided not to send senior officials to the Beijing Olympics in February — a move that will align it with the U.S. diplomatic boycott over China's alleged human rights abuses," MSNBC producer Kyle Griffin wrote in his tweet.

Griffin is a senior producer of The Last Word with Lawrence O'Donnell, one of the network's primetime news discussion programs. His tweet referred to Japan's decision to join the U.S. in a diplomatic boycott of China over the Uyghurs' mistreatment.

Far from "alleged," the Chinese government's campaign of detainment, violence and other human rights abuses against the Uyghurs has been affirmed as true by leaked Chinese government documents, firsthand witnesses, a U.K. tribunal as well as the governments of the U.S. and other western countries.

In response to Griffin's tweet, numerous Twitter users accused Griffin of being a mouthpiece for the Chinese Communist Party (CCP). Others suggested that he said "alleged" because NBC will be broadcasting the 2022 Beijing Winter Olympics.

Newsweek contacted MSNBC for comment.

Twitter user Gail Helt wrote in response to Griffin's tweet, "I generally don't like to pile on...but I will. 'Alleged?' Try 'well-documented.' Try 'known.' 'alleged' denies the experiences of the Uyghurs who escaped China, the millions in these camps, and those killed by the CCP. Don't do that. Don't be an unwitting CCP mouthpiece."

Rushan Abbas, founder and executive director of the Campaign For Uyghurs, tweeted, "As a relative of an Uyghur victim of #China's genocidal policies, @kylegriffin1, I'm offended with your choice of words. 'Alleged' human rights abuses? Are Uyghur lives & testimony discardable? For Americans, genocide must be a hard line. #BoycottBeijingOlympics"

In November, hundreds of pages of confidential Chinese government documents showed evidence of Chinese President Xi Jinping's personal role in orchestrating oppression of the Uyghurs in China's Xinjiang region, according to German researcher Adrian Zenz.

The documents showed evidence that China deliberately forced Uyghurs to undergo sterilization in a bid to control the Muslim population. China also subjected other Uyghurs to rape and torture in detention centers and forced labor camps, Zenz said.

The governments of the United States, Canada, Britain, Belgium and the Netherlands have all called China's actions against the Uyghurs "genocide" and "crimes against humanity."

In late December, U.S. President Joe Biden signed the Uyghur Forced Labor Prevention Act. The bill bans imports from the Xinjiang region unless businesses prove the items weren't created by forced labor. The bill passed with enormous bipartisan support.

In response, the Chinese government accused the U.S. of "smearing" China with falsehoods about the Uyghurs. Beijing described the reports of Uyghur abuses as the "lie of the century."

However, in early December, the Uyghur Tribunal—an independent body of businesspeople, lawyers and academics, unofficially put together by a British barrister—said it had decided "beyond doubt" that China committed genocide and crimes against humanity through its mistreatment of Uygurs.

The tribunal saw the aforementioned leaked documents and heard from multiple witnesses, including Uyghurs who provided firsthand testimony of the abuse they suffered.

China Uyghurs human rights MSNBC news producer
An MSNBC news producer has come under fire for his tweet that used the word "alleged" when referring to China's human rights abuses against Uyghur Muslims. In this photo, protesters attend a rally in Hong Kong on December 22, 2019, to show support for Uyghurs in China.Dale De La Rey / AFP/Getty