By Chris Hogg
BBC correspondent in Hong Kong
Thousands of people in Hong Kong have taken part in a march to mark the crushing of the 1989 pro-democracy movement in Beijing.
Marchers said they wanted to send a message to Beijing
The marchers called for an inquiry into the suppression of the 1989 protests.
It was organised by the Hong Kong Alliance in Support of Patriotic Democratic Movements in China.
Many of its leading members are pro-democracy lawmakers who have not been allowed into mainland China since the group was formed.
Message to Beijing
Marching under banners saying "Tell the truth, demand accountability for the 4 June massacre" and "Return power to the people", the protesters made their way through the streets of the Wan Chai district of Hong Kong.
Hundreds of police were on duty in case of trouble during the march, which is an annual event.
Shoppers watched as the long column of marchers passed by.
Marchers said they were out on the streets to send a message to Beijing. They want an investigation into the brutal suppression of the Tiananmen Square protests in 1989.
Some also carried signs demanding universal suffrage, a reference to the continuing struggle for democracy here in Hong Kong and in China as a whole.