A GROUP of 29 men and a woman believed to be members of the Wo On Lok triad gang were arrested by police after they gathered in Li Cheng Uk Estate, Shamshuipo, last night. Officers believed the group, seen on the first-floor podium of Yan Oi House, might have been preparing to meet a rival gang for a fight. Police searched the area for weapons, but could find only a baseball bat hidden in some bushes. Early this morning, the 30 suspects were being questioned by anti-triad squad detectives. They were initially detained on suspicion of unlawful assembly, but no charges have been laid.