The almost 800 page reports just been released.
It reveals police oversight of the licensing system was not up to standard, with too little scrutiny of the gunman's referees, and whether they could vouch for his being a responsible person.
Chief political reporter Alex Mason told Phil Gifford and Simon Barnett that police accepted referees he'd only ever seen sporadically.
"It included a friend he played online games with for 10 years, but only met in person for three weeks over that entire time, and the person's parent."
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