Hong Kong remembers Tiananmen Square protest

Because of its special status, Hong Kong is the only place on Chinese soil where such commemoration is allowed. Over the last weeks, activists in other parts of China have tried to organize their ceremony, but that was in vain. The United States is urging China to free all prisoners still being held for the 1989 Tiananmen Square protests. Al Jazeera's Steve Chao reports from Hong Kong.