At this difficult time, Britain is faced with some hard questions the people charged with protecting us are going to have to answer sooner or later.
The Manchester suicide bomber Salman Abedi was known to the authorities.
He is believed to have travelled to the Middle East and become radicalised before returning to the UK to cause carnage at a gig in the city where he was born just days later.
As his father and brother were arrested in Libya, security force sources there said the father had links to Al Qaeda and another source claimed the brother 'was aware of all the details' of attack plans.
Yet he was allowed to walk back to the UK unchallenged. ...