Police also seized bomb-making equipment, together with chemicals, communication kits and air rifles as well as HK$90,000 in cash. They also froze a total of HK$600,000 in related funds.

Detailing the suspects' actions, Li said there was a clear division of tasks among the group members, with some responsible for purchasing chemicals while a small faction focused on bomb-making. There was also an action team, which was responsible for placing the bombs.

The radical group had sufficient funds to pull off the plan and planned it meticulously with video footage showing them scouting various courtrooms, he said.

Police condemned such "crazy" and "extremely irresponsible" acts and urged people in the chemical industry to keep a close eye on any suspicious activities.

Li also urged parents to take care of their children during the summer holidays, preventing them from getting involved in crime.