Climbing on the roof of a bus, students displays c

BEIJING, CHINA - JUNE 3: Climbing on the roof of a bus, students displays confiscated machine gun, helmet and military caps after they forced tens of thousands of troops to retreat from central Beijing 03 June 1989. On the night of 03 and 04 June 1989, Tiananmen Square sheltered the last pro-democracy supporters. Chinese troops forcibly marched on the square to end a weeks-long occupation by student protestors, using lethal force to remove opposition it encountered along the way. Hundreds of demonstrators were killed in the crackdown as tanks rolled into the environs of the square. (Photo credit should read CATHERINE HENRIETTE/AFP via Getty Images)