Anti-triad police on Saturday arrested a 31-year-old woman on suspicion of running an unlicensed bar, following a raid at an industrial building on Tak Yip Street in Yuen Long.
Officers also arrested six men and three women, aged between 22 and 40, on suspicion of drinking at an unlicensed place.
Police said they had seized about 3,000 cans of beer, wine glasses, and dice cups from the scene valued at about HK$100,000.
The suspects have been released on bail and must report back to the police next month.