A girl takes part in a candlelight vigil to mark the 28th anniversary of the crackdown of the pro-democracy movement at Beijing's Tiananmen Square in 1989, at Victoria Park in Hong Kong, China June 4, 2017. REUTERS/Bobby Yip

Nearly three decades after Beijing sent tanks and troops to quell the 1989 student-led protests, Chinese authorities ban any public commemoration of the event on the mainland and have yet to release an official death toll.
Estimates from human rights groups and witnesses range from several hundred to several thousand killed.
Hong Kong, a former British colony that returned to Chinese rule in 1997, is the only place on Chinese soil where a large-scale commemoration takes place, symbolizing the financial hub’s relative freedoms compared with the mainland.
This year’s events are especially politically charged, coming just a month before an expected visit of President Xi Jinping to mark 20 years since Hong Kong was handed back to China.
“When Xi Jinping comes, he’ll know the people of Hong Kong have not forgotten,” Lee Cheuk-yan, an organizer of the annual candlelight vigil, said.
On a somber night, many held aloft flickering flames, sang songs …
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