The suspects included six secondary school students, and were part of a group called Returning Valiant, national security police senior superintendent Steve Li told journalists on Tuesday. Police displayed a number of items they said were seized from a hostel room where the arrestees were allegedly "preparing" to make explosives, based on the presence of "chemicals that could be turned into TATP." Li claimed that the group planned to detonate explosives in cars and trash bins.
Hong Kong chief executive Carrie Lam called for the close "monitoring" of children and young people to prevent them from being "indoctrinated" through unsupervised use of the internet.