25th anniversary of Tiananmen Square massacre.

CLEAN : Three dead in Tiananmen Square vehicar

CLEAN: Exterior shots of The Great Hall of the People in Tiananmen Square on January 01, 1999 in Beijing, China.

Mao portrait and crowds in Tiananmen Square

25th anniversary of Tiananmen Square massacre.

Crowds at Tiananmen Square for China National Day

Empty Tiananmen Square and police van

25th anniversary of Tiananmen Square massacre.

CLEAN: Exterior shots of a helicopter flypast over Tiananmen Square, forming a '70' to mark the 70th anniversary of the People's Republic of China on 1 October 2019 in Beijing, China

Images of Beijing's Tiananmen Square on the 33rd anniversary of the deadly 1989 crackdown on pro-democracy protests (Footage by AFPTV via Getty Images)

Tourists in Tiananmen Square on NPC opening day

Red flags flying in Tiananmen Square

Red flags blowing in Tiananmen Square

CLEAN : Chinese flock to Tiananmen Square

Tourists watching flag raising ceremony in Tiananmen Square

Tourists watching flag raising ceremony in Tiananmen Square

Tourists watching flag raising ceremony in Tiananmen Square

CLEAN: Exterior shots of crowds in Tiananmen Square, some waving Chinese flags, having their pictures taken in front of the large mural of Chairman Mao on March 6, 2010 in Beijing, China.

Then and now photo slideshow that compares images of the Tiananmen Square protests taken in 1989 in Beijing with the same scene today 30 years after the crackdown (Footage by AFPTV via Getty Images)

Crowds and police in Tiananmen Square

CLEAN : Time lapse sequences

FILE PHOTOS of key Chinese Communist Party figures including Mao Zedong and Zhou Enlai as well as the deadly 1989 crackdown on students in Tiananmen Square (Footage by AFPTV via Getty Images)

Jailed Hong Kong media mogul Jimmy Lai was among three democracy campaigners convicted on Thursday for taking part in a banned Tiananmen vigil as the prosecution of multiple activists came to a conclusion (Footage by AFPTV via Getty Images)

CLEAN: External shots of red Chinese flags at a military army parade in Tiananmen Square, Beijing, China, to mark the defeat of Japan in World War Two - WW2, Second World War - 70 years ago, in 1945. Mis shot of a large flag raised high...