The world marveled for weeks as Chinese university students seeking democratic reform in their communist-run country slept, ate and demonstrated in and around the heart of Beijing's Tiananmen Square. But on the infamous morning of June 4, 1989, the Chinese government unleashed its tanks and troops on the square, bringing the peaceful protests to a violent end. Though the number of people killed in the crackdown is disputed to this day, estimates of the dead vary between several hundred to several thousand.