Minh Shang, who said the men were all young men, was accused of throwing a stone at the police station and the army.

Police and defence forces are on high alert ahead of planned protests this evening.

At least six protesters were wounded in clashes over the weekend at Dong Nai, with one hospital source saying at least 10 people were injured.

The three men were detained by security forces near the scene of the incident at Dong Nai, south-east of Taoyuan.

Reports said the two others were injured in clashes near the military-run Tianshan prison. Both were later released.

All three men have worked for Tianshan, but have only recently been dismissed, according to reports. Their names have not yet been made public.

Chinese police do not provide any details about the whereabouts of detained suspects, but the Hong Kong government has said its police force is prepared for public protests even during major events such as the Lunar New Year.

Earlier on Sunday, protests were reported in Kowloon, with small, peaceful demonstration-goers voicing concerns over a rise in incidents of ethnic violence in the city, including deaths.

Calls to close the notorious Kowloon Walled City jail were also reported.

A video posted online showed a young woman allegedly hitting an elderly man with an egg as she shouted: “You are a scumbag!”

Another video showed a man holding a rock to another man’s head as they made their way through a forest.

Several groups of protesters marched near a large building block in the city in the early hours of Sunday, according to video footage posted on social media.

Later in the morning, dozens of riot gear-clad police were seen in the area.

“The public in Hong Kong needs to wake up! Police cannot just control the political events, but also should not take action when those events are violent” Kishan Sun, an Asian student protester in Hong Kong

Meanwhile, a group of Hong Kong activists were due to hold what some called a “day of action” as part of the ongoing demonstrations against Beijing’s rule.

The protests are the biggest to hit the city since demonstrations against Beijing brought tens of thousands of students onto the streets of 2013.

A rally with about 50,000 demonstrators was expected today in Victoria Square.

“The public in Hong Kong needs To wake up