Members of the group have expressed hatred against the government, promoted violence, and planned actions involving extreme violence, including stabbing police officers and government anti-epidemic personnel.

They were found discussing how to buy and use stun guns and other offensive weapons, as well as how to make bombs.

It was understood that the group had more than 2,000 messages, including words like "massacre" and "large explosion".

After investigation and intelligence analysis, officers arrested six of the group members last Saturday, involving four men and two women aged 16 to 36.

They were suspected of inciting others with the intent to do grievous bodily harm, publishing seditious publications, and possessing offensive weapons, imitation firearms and dangerous drugs.

The six were believed to be the mastermind of the organization, including the group owner, group admin and active members.

Superintendent Wilson Tam Wai-shun of the Cyber Security and Technology Crime Bureau said the police had earlier identified the radical group, which had been active on social media platforms since February.

During the operation, police seized nine cell phones, a computer, 15 arrows, two imitation firearms, and a small amount of suspected cannabis.

Three of them were charged with one count of "incitement to commit wounding with intent" and will appear at Eastern Magistrates' Courts on Tuesday morning.

The operation is still underway and further arrests were not ruled out.

Among the arrested, a 35-year-old man, reported as a warehouse worker, was believed to be the leader of the group and its owner.

The rest of the arrests included a 17-year-old unemployed person, a 16-year-old student, a 36-year-old reported computer technician, a 19-year-old student and a 28-year-old security guard.