China has urged United Nations member states not to attend an event planned next week by Germany, the United States and Britain on the repression of Uyghur Muslims and other minorities in Xinjiang, according to a note seen by Reuters on Friday. 

"It is a politically-motivated event," China's UN mission wrote in the note, dated Thursday. "We request your mission NOT to participate in this anti-China event."

China charged that the organisers of the event...