Hong Kong's Apple Daily notes that Sina Weibo, a microblog service, temporarily blocked searches for keywords such as "Zhu Ling", "Sun Wei" and "thallium poisoning" last week.
Over 100, 000 people have already signed a petition on the White House website alleging that Zhu Ling's former Tsinghua roommate, Sun Wei, be deported from the US and face investigation, says Southern Metropolis Daily.