Kadeer, speaking through an interpreter, said she hopes the United States will not remain "silent and indifferent" to the Uighurs' plight and warned of the executions of those detained following the riots. (1)Condemnation strikes me as unlikely. Unlike Iran, the PRC is a major economic and strategic partner of the USA. So - like Israel in the Occupied Territories and Russia in Chechnya - it gets to do pretty much as it pleases.
Also, the Bastards of Beijing are our staunch allies in the War on Terror. Given that agents of the PRC were brought in to interrogate Uighurs imprisoned at Guantanamo - all of whom were later cleared and released - I don't think the fate of the Uighurs in general, or those arrested after the riots, will be of much concern to the USA.
1 - "Uighur activist urges US to condemn China," by Foster Klug for the Associated Press, published by the Taiwan News, 21st of July, 2009. (http://www.etaiwannews.com/etn/news_content.php?id=1008905&lang=eng_news)
2 - "US Lawmakers Demand Answers on Uighur Detainees," by Michael Bowman, published by VOA News, 16th of July, 2009. (http://www.voanews.com/english/2009-07-16-voa59.cfm)