Violent clashes broke out between police and pro-democracy demonstrators on Sunday after thousands took to the streets of Sham Shui Po district for an unauthorised march as a part of the ongoing anti-government protests.
Signs held by protesters in the arrival hall included those saying "there are no rioters, only tyranny", while pamphlets stacked in piles warned visitors of the heavy use of tear gas by police.
Sunday also saw the third day of a peaceful sit-in at Hong Kong's global airport, There have been no reports of arrests there and flights are operating as scheduled.
Demonstrations began in opposition to a proposed extradition bill, which would have allowed suspected criminals to be sent to mainland China for trial.
In the early hours on August 11, the Hong Kong government released a press release saying that it had arrested 16 people overnight for "unlawful assembly, possession of offensive weapon, assaulting a police officer, and obstructing a police officer in the execution of duties".
A flyer was put on the U.S. emblem during the protest outside the U.S. General Consulate in Hong Kong.
The city's Beijing-appointed leader Lam has ruled out granting the protesters' demands, which include a full withdrawal of the now-suspended extradition bill, direct election of the city's leader and an investigation into police violence. The police have tried several tactics to rein in the protesters and restore normalcy in the city, a major Asian financial hub and business centre.
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With the protests becoming increasingly violent, they are no longer peaceful expressions of demands, but have undermined the rule of law and basic order in Hong Kong, seriously affecting the HKSAR government's governance.
"All the money from the mainland that has propped up Hong Kong property markets could reverse as quickly as it flowed in", he said.
Tear gas was sacked in the busy shopping district of Tsim Sha Tsui as well as in Wan Chai on Hong Kong Island.
Ai, who was interviewed on the BBC's Today Programme, said he does not believe Britain or the west is interested in getting involved in the dispute, which has been described as the region's "most serious crisis for decades".
"You've arrived in a broken, torn-apart city, not the one you have once pictured", one flyer said. "China deplores and firmly opposes the remarks", said the Office of the Commissioner of the Ministry of Foreign Affairs in Hong Kong. The flag was then replaced with flags bearing the words "Hong Kong Independence".
By Tuesday, the MSCI Hong Kong Index was on a 10-day losing streak of the kind it hasn't seen since 1997, in the runup to its handover from a British colony. But sizable battles between masked and hard hat-fitted protesters and police continue.
At Tai Po, a residential area in the New Territories, protesters turned up for a planned march despite not receiving police approval.
Ortagus said it was the job of USA diplomats and those from other countries to meet with different people, including opposition leaders.