Security has been stepped up around Tiananmen Square on the 30th anniversary of the bloody government crackdown on pro-democracy protesters.
Chinese officials have removed several high-profile dissents by either placing them under house arrest or removing their phones.
At the same time, extra checkpoints in the square have been installed while streets are now closed to tourists who have arrived to watch the daily flag-raising ceremony.
Hundreds, if not thousands of people are believed to have been killed in Beijing in 1989 when the government sent in the military to clear Tiananmen Square of protesters.
The operation began on the night of June 3 and ended the following morning.
For many Chinese people, the 30th anniversary of the crackdown will pass like any other day.
Any commemoration of the event is not allowed in mainland China, and the government has blocked access to information about it on the internet.
When asked by foreign journalists, the government defended its actions on that night by pointing to the countrys economic success since then.
The tremendous achievements in Chinas development in the past 70 years have fully proven that the development path we have chosen is completely correct, foreign ministry spokesman Geng Shuang said.
Analysts say the crackdown set the ruling Communist Party on a path of repression and control that continues to this day.
In China, the massacre is known as the June Fourth Incident.
The government rebuked US Secretary of State Mike Pompeo for saying that China needed to make a full, public accounting of those killed or missing to give comfort to the many victims of this dark chapter of history.
In April 1989, more than one million pro-democracy protesters occupied Tiananmen Square.
It was the largest political demonstration in Chinas history and lasted six weeks until government troops rolled in and opened fire.
The government always denied that anyone was shot dead in the square itself.