Hong Kong police forcefully dispersed protesters gathered to commemorate the July 21 Yuen Long train attack in Hong Kong, on Monday.

Protesters were heard chanting "Liberate HK, age of revolution, 5 demands, not one less" as they staged a sit-in amid a heavy police presence.

At least 45 people were injured in the Yuen Long incident on July 21, after around a hundred armed and masked men attacked commuters and anti-government protesters inside the Hong Kong Mass Transit Railway (MTR) station of Yuen Long.

The sit-in took place as Hong Kong continues to be rocked by weeks of mass protests after the government tried to introduce a now-suspended bill that would have allowed for the extradition of the city's residents to mainland China to face trial.

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