Police said the operation came as recently videos showing a large group of people gathering in Tsim Sha Tsui and hitting a private car had come to their attention.

After in-depth investigation, officers from Yau Tsim district anti-triad unit arrested four men aged 28 to 33 across the city for taking part in an unlawful assembly. They are all remanded for questioning.

A gang fight between two triad societies Wo Shing Wo and Sun Yee On took place around 4am on Thursday in Tsim Sha Tsui, where about 50 thugs were spotted surrounding a white car and kept hitting it with hard objects.

The footage filmed by residents nearby was later upload online and went viral.