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Two far-right extremists who encouraged copycat terror attacks in the aftermath of the New Zealand mosque shootings have been jailed.

Morgan Seales, 20, and Gabriele Longo, 26, communicated on a WhatsApp group set up shortly after the attacks in the city of Christchurch on March 15 which left 51 people dead.

The purpose of the group chat was to encourage users to emulate the accused gunman with further attacks on Muslims, Leeds Crown Court heard.

Within 90 minutes of joining the group, Longo was offering to post files from his online library of bomb-making instructions, which he then did the following day.

When one contributor wrote "let's kill some Muslims", Longo replied: "Or Jews."

In a separate post, Seales wrote: "The best time to attack a mosque is Friday prayers or a wedding. Everyone there at once."

The court heard Seales, from South Shields , had first come to the notice of authorities in 2017 with a Twitter post which displayed the flag of banned neo-Nazi terror group National Action.

He was then arrested in February 2018 on suspicion of taking screenshots of recipes for explosives.

However, police decided not to prosecute Seales, described as "vulnerable and socially isolated", and tried to deradicalise him through the voluntary Prevent counter-terror programme.

Support workers were allocated and he was even treated to a trip to the seaside, the court was told.

Sentencing, Judge Tom Bayliss QC said that in reality the progamme had little or no effect as Seales was arrested for the Christchurch messages and the recovery of his mobile phone led to officers tracing Longo.

The court was told Seales suffered from a personality disorder and had a "very difficult childhood" in which he battled anxiety and depression with the aid of children's services but had "fallen through the net" of adult support services.

Judge Bayliss said Longo, from Crawley, West Sussex, was "something of an enigma" as little was known about him but he was satisfied he was "deeply radicalised".

Both defendants were convicted by a jury of encouraging terrorism, possessing material for terrorist purposes and collecting or making a record of information useful to a terrorist.

Longo was also found guilty of disseminating terrorist publications.

Longo, of Burdock Close, was jailed for six years and must serve an extended licence period of 12 months.

Seales, of Turner Avenue, was jailed for four years and will be on extended licence for two years when released.

Judge Bayliss told both men that their "personal inadequacies and isolation" explained to some extent why they engaged in the group chats.

He added: "Both of you were in danger of indoctrinating others in that group chat. There were some very young people, some as young as 14.

"Your activity posed not only a threat to Muslims who were your potential victims but also a threat to everyone in our democratic society."