The issue of Hong Kong's triads has recently resurfaced following an incident last Sunday in which a mob of men armed with sticks and batons beat up commuters and passers-by in a metro station in the northern district of Yuen Long. Police have since arrested 12 people over the attack, a number with links to organised crime gangs. Here's a look at who these triads are.
Triads have a long history - and mixed repute - in Hong Kong and China.
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