China puts its censorship apparatus to use Thursday, as it flooded Tiananmen Square with cops and cracked down on would-be protesters all over the country. Reporters were barred from entry to Tiananmen, and those that did make it were followed by cops who blocked their cameras with open umbrellas, "a comical dance" that was broadcast on several news networks, the New York Times reports. The Times also reports that there may have been more undercover cops than citizens at the site of the infamous oppression. Throughout the country, those with ties to the incident have been harassed by the Chinese authorities. One activist said that he had essentially been put on house arrest since May 15. Meanwhile, a massive vigil attended by as many 150,000 people was held in Hong Kong in honor of those that died 20 years ago Thursday.