Police in Hong Kong on Sunday detained 16  pro-democracy activists on the anniversary of the Tiananmen Square massacre, media reports said.

Security chief Chris Tang Ping-keung had earlier warned authorities would take “resolute action” against anyone threatening national security as the date approached, and hundreds of officers fanned out across Victoria Park and nearby streets in Causeway Bay on Sunday, checking bags of passers-by and cautioning residents who stopped to linger, reports South China Morning Post.

On the international front, the diplomatic missions of the United States and European Union displayed electric candles in the windows of their offices in Central, while the consulates of Australia, Britain and Canada released messages commemorating the anniversary, the newspaper reported.

The vigil in Victoria Park has not taken place in the city since 2019.

According to reports, It used to draw tens of thousands of residents on June 4.

Among those detained by officers on Sunday was Chan Po-ying, the leader of the League of Social Democrats opposition political party and who was carrying an LED candle and yellow paper flowers, reports South China Morning Post.

Leo Tang Kin-wah, former vice-chairman of the disbanded Confederation of Trade Unions, was escorted into a police vehicle after being searched by officers and taken to the station in Wan Chai. He was wearing a black T-shirt with a print of the front page of the Chinese-language newspaper Wen Wei Po from June 5, 1989.

Police also led away the former chairwoman of the Hong Kong Journalists Association, Mak Yin-ting, and activist Alexandra Wong Fung-yiu, known as “Wong Po Po” or “Grandma Wong”, as she stood on Great George Street holding a bouquet of flowers. Some passers-by chastised police for taking action against an elderly woman, the newspaper reported.

The US State Department on Saturday said it will continue advocating for people’s human rights and fundamental freedoms in China and around the world.

"Tomorrow, we observe the 34th anniversary of the Tiananmen Square Massacre.  On June 4th, 1989, the Government of the People’s Republic of China (PRC) sent tanks into Tiananmen Square to brutally repress peaceful Chinese pro-democracy protesters and bystanders alike. The victims’ bravery will not be forgotten and continues to inspire advocates for these principles around the world," read the statement.

The Tiananmen Square protests, known as the June Fourth Incident in China, were student-led demonstrations held in Tiananmen Square, Beijing during 1989.

In what is known as the Tiananmen Square Massacre, troops armed with assault rifles and accompanied by tanks fired at the demonstrators and those trying to block the military's advance into Tiananmen Square.