The UK has one of the lowest gun crime levels in the world, and some of the strictest firearms laws.
Among the checks carried out before a licence is granted is on an applicant's social media, somewhere Jake Davison was active.
He recently posted on YouTube about being "beaten down by life", cutting an isolated figure.
And he spoke about the misogynistic incel culture, a reference to people unable to find a partner despite wanting one.
Signs, perhaps, of his mindset in the weeks before yesterday's tragedy.
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