Undercover police officers infiltrated the Wo Shing Wo triad in Tsuen Wan in an operation that led to the arrest of two gang leaders, police revealed yesterday. The two suspected triad heads were among 27 people arrested in raids conducted late on Sunday night and yesterday at more than 30 addresses during operation 'Quick Move'. They were arrested after 157 police officers - from units including the district crime squad and anti-triad units - raided the locations, which included three bars and karaoke lounges in Tsuen Wan. The officers used sniffer dogs to search for drugs. Chief Superintendent Austin Kerrigan said that at one location, the officers disrupted a traditional triad ceremony to accept new members. Eight people were arrested there, including four teenagers who were apparently joining. The operation came after undercover officers gathered intelligence by spending the past six months in the triads. The chief superintendent said the agents mingled with the gangsters by working at entertainment venues frequented by triads. 'After gaining their confidence, the undercover operatives were recruited into triad societies and either engaged in, or witnessed, criminal activities,' Mr Kerrigan said yesterday. The officers were involved in 27 cases of criminal acts including bookmaking, manufacturing fake credit cards and drug trafficking. 'During [the intelligence gathering] phase, at least two factions of the triad society were infiltrated,' Mr Kerrigan added.