Hong Kong police officers and pro-democracy protesters have clashed at the city’s airport as anti-government demonstrations continue.
Operations at the airport were severely disrupted for a second day. The scuffles broke out in the evening between police and protesters, after an injured person was taken out of the main terminal by medics.
Several police vehicles were blocked by protesters, and riot police moved in, pushing some protesters back and using pepper spray at times.
Protesters detained two men, declaring that both were suspected undercover police officers who had infiltrated the crowds.
Hong Kong’s police force had earlier claimed to have infiltrated the protesters’ ranks.
Medics removed one man, but another was held for two hours.
His wrists were bound and water poured over his body, after a mainland China card was found in his bag.
The man told the crowd he was a journalist from China.
Eventually emergency services brought the man out of the terminal.
If you would like to see how the protests unfolded, please see what was our live coverage below:
Protesters fought with police officers, who used pepper spray to keep back the crowds.
Several police vehicles were blocked amid heated scenes.
Ms Tong said the man was dressed in black and wore a mask to look like one of them.
"We want to keep him here and investigate," Ms Tong said.
Protesters said the man dropped his wallet when he was running away from them, and they found ID cards from mainland China and also found his name on a list of police officers online.
Hong Kong's police force has previously said it has infiltrated the demonstrators, leading to concerns that officers were inciting violence.
"We'll see what happens."
"It's a very tricky situation. I think it will work out and I hope it works out, for liberty.
"I hope it works out for everybody, including China. I hope it works out peacefully. I hope nobody gets hurt. I hope nobody gets killed," the president said.
"Everyone should be calm and safe!" Mr Trump said.
The man was pictured with his hands bound with cable ties, lying in a fetal position on the ground surrounded by a crowd of protesters as demonstrations continued at the airport for a second day and turned tense late Tuesday.
The chaotic situation eventually ended when protesters allowed ambulance workers to take the man away on a stretcher.
K-pop star Kang Daniel and Scottish band CHVRCHES both announced Tuesday that they are calling off upcoming events. American singer-songwriter Alec Benjamin canceled an upcoming concert late Monday.
Kang's management office said the cancellation of a fan meeting scheduled for Sunday was because of safety concerns related to the protests, while CHVRCHES blamed "unforeseen circumstances."
The airport protests are the latest escalation in a summer of demonstrations aimed at what many in Hong Kong see as an increasing erosion of their freedoms.
A reporter from China's Global Times was seized by demonstrators at Hong Kong airport on Tuesday but was rescued by police, the newspaper's editor in chief said.
"GT reporter Fu Guohao has been rescued by police and sent to the hospital. We're still learning about his injury conditions", Hu Xijin said in a tweet.
Global Times is a tabloid published by the Ruling Communist Party's People's Daily.
In an earlier tweet, Mr Hu had attached a video and said his reporter was tied up by demonstrators.
Protesters had earlier detained a man they believed was an undercover police officer, after finding a mainland China card in his bag.
They fastened his wrists and poured water over his head. The man was eventually taken out of the airport by emergency services.
Hong Kong leader Carrie Lam earlier defended law enforcement actions after protesters prompted an airport shutdown with calls to investigate alleged police brutality.
Ms Lam told reporters on Tuesday morning that dialogue would only begin when the violence stopped. She reiterated her support for the police and said they have had to make on-the-spot decisions under difficult circumstances, using "the lowest level of force."
The embattled leader was speaking before further violence broke out at the airport.
Pro-democracy protesters in Hong Kong want her to resign but Ms Lam has said she intends to remain in her post.
Riot police clashed with pro-democracy protesters outside the building earlier on Tuesday night. Officers armed with pepper spray and swinging batons tried to enter the terminal, while protesters used luggage carts to barricade entrances.
Hundreds of flights were cancelled and passengers have been forced to stay in the city while airlines tried to find other ways to get them to their destinations.
The airport disruptions are an escalation of a summer of demonstrations against what some in Hong Kong see as an increasing erosion of freedoms. The protests have in recent weeks turned to focus on police brutality against demonstrators.
