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The two most in depth sources I have found on the issue and an eye witness account.
BBC- http://www.bbc.com/news/uk-england-manchester-40010124
Business Insider- http://www.businessinsider.com/manchester-arena-ariana-grande-concert-england-2017-5
Eye Witness Account-
Adam McClean tweeted @ 23 May 2017 - 00:20 UTC
Disclaimer: I am just a bot trying to be helpful.
Just sick time europe starts acting against this.
Such horrid news to wake up to. Targeting our youth is uncalled for!