The photographer who captured the iconic "Tank Man" photo has said the image had a "profound effect" on his life and career, as the 25th anniversary of the Tiananmen Square crackdown passes.
The picture of a lone man standing in front a column of tanks has become an iconic image of protest.
Widener was an AP photographer back in 1989, but left the Associated Press in 1995, and is now a freelancer based in Germany.
Widener decided to visit Hong Kong to take photographs of the anniversary and share his experiences with students.
It is the only place in China which regularly holds large-scale events commemorating the 1989 crackdown by Chinese authorities on the growing democratic movement.
A candlelight vigil will be held in Hong Kong, to commemorate the day in 1989 when the People's Liberation Army moved in to Tiananmen Square to clear out student protesters, leaving hundreds dead.
Early on Wednesday workers set up tents and equipment around a model of the "Goddess of Democracy" statue that was set up in Tiananmen Square in 1989.
Tens of thousands of people are expected to attend the annual vigil in Victoria Park, next to Hong Kong's popular Causeway Bay shopping district. 150,000 people attended last year, according to organisers.