Cavan Medlock carried a Nazi flag and a knife into a London solicitors’ offices in 2020 and then launched an attack on staff.
The attack caused so much alarm that senior lawyers lobbied the then home secretary, Dame Priti Patel, to reconsider some of the language she and others were using, claiming that it was adding to tensions.
Leaders in the profession say the incident has led to continuing concern as extreme right-wing groups single out lawyers for abuse and threats.
During his police interview, Medlock said he had chosen the firm and its immigration chief as targets after they had been named in a Daily Mail article three days earlier.
The finding at Kingston Crown Court on Tuesday was not a criminal conviction – but a conclusion by a jury of factually what happened.
A trial of the facts occurs in rare circumstances when a defendant is not well enough to either admit or deny a charge, but a case needs to be concluded.
An attempt to put Medlock on trial in March was aborted after he suffered an episode of very serious mental ill health.
The jury found he had committed the acts of preparing for an act of terrorism and making threats to kill when he stormed into the offices of law firm Duncan Lewis.
A senior judge will decide on Thursday how best to manage Medlock’s detention for public protection because he is too mentally unwell to be in a prison.
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