A new offence to cover lone individuals planning non-terrorist mass killings should be considered in the wake of the Southport attacks, the UK's terror watchdog has said.

Jonathan Hall KC said it was "horrifying" officers couldn't intervene despite knowing Rudakubana planned mass killings.

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Jonathan Hall KC warned against expanding the definition of terrorism, instead calling for a new criminal offence targeting loners who plot mass killings like Axel Rudakubana and Nicholas Prosper