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Thousands of chanting Hong Kong Protesters have joined hands to form human chains across the city.

It comes as the Foreign Office updated its travel advice for people travelling to the territory, warning air passengers to expect disruption and allow extra time for travel.

Anti-government demonstrators held up banners thanking overseas nations for supporting “freedom and democracy” in Hong Kong on Friday.

It marked the 30th anniversary of the “Baltic Way”, when millions created a chain across three countries to protest Soviet occupation.

"I joined the Hong Kong Way because it’s peaceful," said protester Peter Cheung, 27.

"This is the 30th anniversary of the Baltic Way. I hope there will be a bigger chance to make an international noise."

The protest included dozens shining lights from the top of Kowloon's Lion Rock, visible from the main island of Hong Kong.

The protests, which have been ongoing and becoming increasingly violent for nearly three months, show no signs of letting up after after warnings from Communist Party leaders in Beijing and Hong Kong leader Carrie Lam about violence.

Protesters are also planning a "stress test" of the airport this weekend.

The Foreign Office updated its travel warning of air travel disruptions.

A statement on the Foreign Office website reads: "Reports indicate protests are likely to continue, including plans to form a human chain across the MTR Island Line, Tsuen Wan Line and Kwun Tong Line from 7-9pm on August 23 (Friday).

"A large protest action is also planned for August 24 (Saturday) targeting the transportation system to and from Hong Kong International Airport, and in the Kowloon East Kwun Tong area.

"Passengers are advised to allow extra time to travel to the airport."

Previous advice for travellers reads: "You should be prepared that the situation around protests and public gatherings could change quickly, with the potential for significant violence, especially during unauthorised protests."

The advice continues: "In light of ongoing protests and demonstrations in Hong Kong, there are reports of greater scrutiny from mainland authorities at border crossings between the mainland and Hong Kong.

"This includes reports that travellers' electronic devices have been checked at border crossings. You should be aware that the thresholds for detention and prosecution in China differ from those in Hong Kong."

The demonstrations, triggered by a now-suspended bill that would have allowed extraditions to China, have plunged the former British colony into its worst crisis since its return to China in 1997 and pose a major challenge for Beijing.