Hong Kong police said they arrested five people during clashes with pro-democracy protesters at the airport Tuesday night.

Assistant Commissioner of Police Operations Mak Chin-ho said the men, aged between 17 and 28, were arrested for illegal assembly. Two were also charged with assaulting a police officer and possessing offensive weapons as riot police sought to clear the terminal.

More than 700 protesters have been arrested in total since early June, mostly men in their 20s and 30s, but also including women, teenagers and septuagenarians.

Mak gave no further details, but said additional suspects were expected to be arrested, including those who assaulted an officer after stripping him of his baton and pepper spray, prompting him to draw his gun to fend them off.

Hong Kong law permits life imprisonment for those who commit violent acts or acts that might interfere with flight safety at an airport.

An airport security officer checks on a traveller’s flight information at the airport main entrance gate in Hong Kong, Wednesday, Aug. 14, 2019. Flights resumed at Hong Kong’s airport Wednesday morning after two days of disruptions marked by outbursts of violence that highlight the hardening positions of pro-democracy protesters and the authorities in the semi-autonomous Chinese city. (AP Photo/Vincent Thian)

More than 74 million travelers pass through Hong Kong’s airport each year, making it “not an appropriate place of protest,” Mak said.

“Hong Kong police have always facilitated peaceful and orderly protests over the years, but the extremely radical and violent acts have certainly crossed the line and are to be most severely condemned,” he said. “The police pledge to all citizens of Hong Kong that we will take steps to bring all culprits to justice.”

That was backed up by a statement on a newly launched government website set up to provide the latest information on the crisis, which said, “The police will take relentless enforcement action to bring the persons involved to justice.”

Hong Kong airline Cathay Pacific said in a statement it had canceled 272 flights over the past two days, affecting more than 55,000 passengers, while 622 departures and arrivals went ahead.

Cathay also said it has fired two pilots, in an apparent response to their involvement in activity related to pro-democracy protests.

They included one pilot who is “currently involved in legal proceedings.” The airline said earlier this week one of its pilots has been charged with rioting after being arrested during a protest.

It said the second fired pilot “misused company information,” but gave no further details. The Hong Kong Free Press reported that the pilot posted a photo of a cockpit screen on an online forum used by protesters.

The airport disruptions have escalated a summer of demonstrations aimed at what many Hong Kong residents see as an increasing erosion of the freedoms they were promised in 1997 when Communist Party-ruled mainland China took over what had been a British colony.

While Hong Kong’s crucial travel industry suffers major losses, the city’s reputation as a well-regulated center for finance is also taking a hit. Some 21 countries and regions have issued travel safety alerts for their citizens traveling to Hong Kong, saying protests have become more violent and unpredictable.

The demonstrators are demanding Hong Kong leader Carrie Lam step down and scrap proposed legislation under which some suspects could be sent to mainland China, where critics say they could face torture and unfair or politically charged trials.

FILE PHOTO: Protesters gestured as they staged a sit-in rally at the Airport in Hong Kong, Tuesday, Aug. 13, 2019. Protesters severely crippled operations at Hong Kong’s international airport for a second day Tuesday, forcing authorities to cancel all remaining flights out of the city after demonstrators took over the terminals as part of their push for democratic reforms. (AP Photo/Kin Cheung)

Lam has rejected calls for dialogue, saying Tuesday the protesters were threatening to push their home into an “abyss.”

In a statement Wednesday, the Chinese Cabinet’s liaison office in Hong Kong said the protesters had “entirely ruptured legal and moral bottom lines” and would face swift and severe repercussions under Hong Kong’s legal system.

“Their behavior shows extreme contempt for the law, seriously damages Hong Kong’s international image and deeply hurts the feelings of the broad masses of their mainland compatriots,” the statement said.

Most of the protesters left the airport Tuesday after officers armed with pepper spray and swinging batons tried to enter the terminal, fighting with demonstrators who barricaded entrances with luggage carts. Riot police clashed briefly with the demonstrators, leading to several injuries and prompting at least one officer to draw a handgun on his assailants.

The burst of violence included protesters beating up at least two men they suspected of being undercover Chinese agents. Airport security appeared unable to control the crowd, and paramedics later took both men away. Police have acknowledged using “decoy” officers, and some protesters over the weekend were seen being arrested by men dressed like demonstrators — in black and wearing face masks.

Hu Xijin, editor-in-chief of the Global Times, identified one of the men as a journalist at the nationalistic Chinese tabloid.

“Fu Guohao, reporter of GT website is being seized by demonstrators at HK airport,” Hu wrote on his Twitter account. “I affirm this man being tied in this video is the reporter himself. He has no other task except for reporting.”

Protesters on Wednesday apologized that some of them had become “easily agitated and over-reacted.” On posters, the demonstrators said they have been “riddled with paranoia and rage” after discovering undercover police officers in their ranks.

Earlier this week, the central government in Beijing issued an ominous characterization of the protest movement as something approaching “terrorism” — a label it routinely applies to nonviolent protests of government policies on the environment or in minority regions such as Xinjiang and Tibet.

President Donald Trump tweeted that U.S. intelligence believes that the Chinese government is moving troops to its border with Hong Kong and that, “Everyone should be calm and safe!”

While China has yet to threaten using the army — as it did against pro-democracy protesters in Beijing in 1989 — recent police exercises across Hong Kong’s border with mainland China were a sign of its ability to crush the demonstrations, even at a cost to Hong Kong’s reputation as a safe haven for business and international exchange.

Images on the internet showed armored personnel carriers belonging to the People’s Armed Police driving in a convoy Monday toward the site of the exercises.

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Associated Press video journalist Katie Tam in Hong Kong and writer Kelvin Chan in London contributed to this report.