A police agent went undercover for eight months to help bust the Yau Ma Tei faction of the Wo Shing Wo triad and arrest 46 people, police said on Wednesday afternoon. The triad gang allegedly raked in about HK$2 million a month from its two vice establishments and seven outlets selling obscene discs in Temple Street, according to police. “An undercover officer was deployed to infiltrate the gang in May last year to collect evidence as intelligence showed they tried to extend its influence,” acting senior superintendent Lam Shu-wing of Kowloon West regional crime unit said. Lam believes the triad faction had been operating for about a year. The two vice establishments controlled by the gang were converted from two residential units in Temple Street. A police officer said each flat had three to four rooms and mainland sex workers were arranged to serve clients round the clock. After the eight-month undercover operation, more than 100 officers raided tens of locations across the city around noon on Tuesday. Police arrested 34 men and 12 women, aged between 23 and 67. Officers seized about 18,000 obscene discs worth HK$300,000 and weapons such as meat cleavers and iron pipes. Chief Inspector Ma Kai-keung said the arrests included the faction leader, its core members and nine suspected mainland prostitutes. He said the operation codenamed “Jellysting” was ongoing and further arrests were possible. The 46 suspects were arrested for offences such as claiming to be triad members, unlawful assembly and managing vice establishments and distribution of obscene discs. Ma said the suspects were being held for questioning and none of them had been charged. Police’s figures show there were 1,629 reports of triad-related crimes in the first 10 months of last year, a 6.6 per cent drop from 1,745 in the same period of 2012.