’64’ is the race number for Lin Yuwei and Wu Yanni, an allusion to the 4 June incident.

Chinese authorities routinely scrub the internet of any mention of the incident, which remains taboo.

Pro-democracy protesters in Beijing were shot dead by troops in 1989.

Human rights groups estimate that several hundred to several thousand people were killed that day. They had embraced after Ms Lin won gold in the 100m hurdles race at the Asian Games. The photo shows her wearing lane number 6 next to Ms Wu’s lane number 4.

Weibo, one of China’s biggest social media platforms, was flooded with posts congratulating Ms Lin. Grey squares replaced posts with photos.

It appears that the photo has not yet been completely removed from the internet, since some Chinese news articles still feature the image.

At the Asian Games in Hangzhou, China has won nearly 300 medals so far. It will run until 8 October. The Tiananmen Square massacre is highly sensitive in China, with younger generations growing up knowing very little about it.

The government regularly removes posts pertaining to the massacres from the internet.

A popular Chinese influencer’s livestream last year ended abruptly after he showed his audience a vanilla log cake that looked like a tank on the eve of the 33rd anniversary of the massacre – a reference to a famous image of one so-called Tank Man, which depicts a civilian trying to block a queue of tanks with shopping bags.