Man stabbed in Boots in north London 'as he tried to stop shoplifter'

Summary
Heroic member of the public was trying to help security staff stop the thief from leaving the store when he was stabbed
Description from Standard.
Who is covering this
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Have-a-go hero, 58, stabbed inside Boots in horror high street attack
Scotland Yard says the man was trying to help security stop a shoplifter.
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Man stabbed in Boots in north London 'as he tried to stop shoplifter'
Heroic member of the public was trying to help security staff stop the thief from leaving the store when he was stabbed