A police agent successfully infiltrated a triad society and spent almost two years undercover establishing contacts with three societies before the arrest of 25 suspects last week, a court heard yesterday. The 25, including six teenage girls and a 15-year-old boy, appeared in Sha Tin Court yesterday in relation to alleged triad activities exposed by the Organised Crime and Triad Bureau undercover operation launched in September 2007. They were aged between 15 and 44 and were arrested in various areas of the city last week. Once one gang had been infiltrated by the undercover agent, he successfully established contacts with members of three prominent triad societies - Sun Yee On, Wo Shing Wo and Wo On Lok. The defendants faced a total of 17 charges, including claiming to be a member of triad society, attending triad meetings and acting as a member of a triad society. Seven face a charge of affray in relation to a group fight that took place on February 28 last year in a Kwun Tong playground. Prosecutors yesterday said the 17 charges might not be all the defendants would face and advice was being sought from the Department of Justice before they pursued further charges. The court was told that the undercover agent was able to detail 44 alleged triad events, which the prosecution considered could result in more charges, pending legal advice. The court also heard that the investigation would continue and there were still more than 20 identified people who were sought by police. The prosecutors also revealed to the court that four defendants had already been positively identified by the agent and three of them were believed to be 'middle-to-high ranking leaders' in their respective triad societies. The three alleged leaders are Chong Yam-wai, 44, Lui Kwun-fai, 37, and Wong Kwan-hap, 28. Four teenage girls and a 15-year-old boy were released on bail, and the rest remanded into custody. Magistrate Symon Wong Yu-wing yesterday adjourned the case to April 20 to be heard in Kowloon City Court.