Six high schoolers are part of a group of 9 arrested in Hong Kong over an alleged terrorist plot to target the city’s courts, transport networks and streets. The group are aged between 15-39yo, and authorities say they took a room in a hotel to build bombs with the highly explosive chemical triacetone triperoxide. The group are being held under the territory’s national security law which carries a maximum life sentence for breaches. Earlier yesterday, the territory’s chief executive Carrie Lam warned against “illegal ideas” spreading through the city and urged parents, teachers and religious leaders to monitor children and report any suspected crimes.