Daniel De Simone

Judge Rebecca Poulet QC said the online propaganda they created was “particularly dangerous" and “abhorrent as well as criminal by reason of their clear intention to encourage terrorist acts”

The defendants, who appeared at the Old Bailey by video link from HMP Belmarsh, did not react. The teens used pseudonyms to run personal accounts on Gab, as well as sharing control of the Sonnenkrieg page, on which they posted self-designed propaganda that encouraged attacks.

Among other things, the imagery suggested Prince Harry was a "race traitor" who should be shot, glorified the Norwegian mass murderer Anders Breivik, and said white women who date non-white men should be hung. The material was "uniformly violent and threatening”, the judge said

Sonnenkrieg was influenced by the US-based group Atomwaffen Division, which is linked to five murders, and the vile American neo-Nazi James Mason. Szewczuk even maintained a blog that encouraged the rape, torture and murder of women and babies

In online comments, Dunn-Koczorowski suggested that decapitating babies would be acceptable to prevent them becoming “leftist politicians” and proclaimed “terror is the best political weapon for nothing drives people harder than a fear of sudden death”

It is understood that Dunn-Koczorowski joined the now banned terrorist group National Action as a schoolboy and later played a role in two successor organisations - System Resistance Network and NS131 - before taking up with Sonnenkrieg

In April, Szewczuk admitted two counts of encouraging terrorism and five of possessing documents useful to a terrorist. His co-defendant pleaded guilty in December to two counts of encouraging terrorism