Hong Kong police arrested more than 400 people, including 25 suspected triad members, during a seven-day operation against crime activities in Yuen Long in the New Territories.
Police raided 35 locations including illegal gambling dens, vice dens and unlicensed bars in the district and arrested 220 men and 193 women aged between 17 and 81, Wen Wei Po reported.
They were arrested for various offenses, including operating gambling establishments, possessing weapons, selling alcohol without a license, drug trafficking and breaching the conditions of their stay.
Those arrested included 11 people from Thailand, six Nepalese, three Pakistani, one Egyptian, two from Bangladesh, two from the Philippines and two from Vietnam. Three of them were asylum seekers.
The police said they noticed a crime syndicate had been operating illegal gambling dens in Yuen Long late last year. So, in February, two undercover cops were sent to collect intelligence.
During the operation, police raided to two gaming centers, 15 illegal gambling dens, 14 foot-massage centers and four unlicensed bars.
They confiscated 16 fishing-game machines, 37 slot machines and 28 mahjong tables, along with HK$200,000 (US$25,490).
They also raided to a public housing apartment and confiscated weapons including batons, an axe, a knife and some gloves and face masks.
Some 40 grams of a suspected illegal drug with a market value of HK$30,000 plus 600 bottles of beer were seized.
Police believed that the triad had been making around HK$500,000 a day.