A 13-year-old boy who allegedly recruited his schoolmates into a triad gang was among 42 people arrested in a series of raids in Tseung Kwan O yesterday. The Form One student, who reportedly joined the Sun Yee On triad when he was 12, was arrested on suspicion of recruiting three schoolmates at a school in April and May, according to investigators. 'He ordered other students to pay $3.60 as lai see to become followers. He did not use violence but verbally threatened them,' acting Chief Inspector Fan Wing-hong, of Kwun Tong police station, said. 'He claimed he was a Sun Yee On triad member and told schoolmates that if you needed protection, you joined Sun Yee On and no one would dare to beat you.' Police said it was one of two triad-related cases at the school in the first half of this year. Acting senior Superintendent Edmund Law Ngan-hung said the police would continue to co-operate with schools to deal with the problem. Officers said the schoolboy was a member of the Sun Yee On, which became active in Tseung Kwan O about a year ago. As well as the school recruitment, the gang allegedly turned government land into a car park in a village and extorted money from car owners, police said. Investigators said the village head was suspected of being one of three key gang members. 'Car owners were ordered to pay $500 to $1,000 a month in extortion fees. Those who refused to pay faced damage to their vehicles,' Mr Law said. He said the gang also demanded protection money from hawkers and shop owners in Tseung Kwan O and ran two gambling dens. Some members were also accused of being involved in the sale of illegal fuel in the district. Anti-triad officers began investigating the gang about three months ago after receiving complaints. About 40 officers launched the crackdown operation on Thursday. During the two-day operation codenamed 'Fishcatchers', officers arrested 23 men and 19 women and seized knives, water pipes and a baseball bat. Investigators believe 10 of those were triad members, including the schoolboy and the village head. Most of the others were arrested to illegal gambling. The schoolboy was arrested in his Sai Kung home on Thursday. He has been released on bail pending further investigations.