Chinese People's Liberation Army soldiers drill prior to lowering the national flag at sunset on Tiananmen Square in Beijing, China on June, 04, 2007. On June 4, 1989, People's Liberation Army troops and tanks crushed student-led pro-democracy demonstrations centered on Tiananmen Square, killing possibly thousands of workers and students. Tiananmen Square was quiet on Monday, and China's media was silent about the bloody crackdown that took place in and around the square 18 years ago to the day.  (UPI Photo/Stephen Shaver) Stock Photo