Hong Kong (CNN) As commemorations for the 30th anniversary of the Tiananmen Square massacre take place worldwide Tuesday, any coverage or discussion of the event will be tightly censored in China . Hundreds of people were killed on June 4, 1989 , as People's Liberation Army troops cracked down on pro-democracy protesters in and around Beijing's Tiananmen Square. Thousands of people hold candles during a candlelight vigil on June 4, 2016 in Hong Kong, Hong Kong. The biggest event will take place in Hong Kong, the only place on Chinese soil where mass commemorations are held. Tourists were visiting Tiananmen Square as usual on Tuesday, under the close watch of police and subject to frequent security checks.

Source: CNN June 04, 2019 00:35 UTC