In Hong Kong, some 55,000 people gathered on Monday to mark the 18th anniversary of the Tiananmen Square massacre. Hundreds, if not thousands, of people are believed to have been killed when Chinese troops were sent into Tiananmen Square on June 4, 1989, to quash weeks of student-led democracy demonstrations.

Yeung Sum, of Hong Kong’s Democratic Party: “So I think the Chinese government has to apologize, has to set up an inquiry to look into the cause. And they also have to give compensation to all those victims concerned, and they have to let those political dissidents who fled away from China to go back to their hometown.”

In China, human rights activists say at least six dissidents were detained in recent days ahead of the anniversary. At least one member of the group Tiananmen Mothers was placed under house arrest. A former student demonstrator was detained after being interviewed on Voice of America.