An inquiry's found there was a failure to act on a tip-off from a member of the public who reported the bomber, Salman Abedi, acting suspiciously.
Sir John Saunders, who is chairing the probe into the 2017 terror attack, said 'more should have been done' by police and security before Abedi detonated his device outside an Ariana Grande concert, killing 22 innocent people and injuring hundreds more.
In a damning first report from the inquiry, Sir John said the arena's operator SMG, security company Showsec and British Transport Police (BTP) were 'principally responsible for the missed opportunities' - but there were also 'failings by individuals'.
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