Not sure if this has been mentioned yet:
"Let it not be said that Muslims didn’t cooperate with the authorities to report Abedi. Abedi flew a black Jihadi flag out of his window in Manchester. He was banned from his mosque. His Imam reported him. His family reported him. His friends reported him. He wasn’t a lone wolf – he was a known wolf.
But MI5 didn’t stop him. Not because they didn’t want to: because they are being run on a shoestring, while Whitehall spends taxpayers’ money on propping up friends in Libya. "
source:
http://www.independent.co.uk/voices/...-a7757726.html
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In other words, the British Muslim community did everything humanly possible to warn authorities about Abedi, but it was British intelligence that dropped the ball.