The moment cop killer was arrested: Video shows officers swooping on 'extremist' and seizing ammunition - but how DID officers miss the pistol he used to kill sergeant by shooting him five times while handcuffed inside police station? | WHAT REALLY HAPPENED

The moment cop killer was arrested: Video shows officers swooping on 'extremist' and seizing ammunition - but how DID officers miss the pistol he used to kill sergeant by shooting him five times while handcuffed inside police station?

The gunman who shot a Metropolitan Police custody sergeant inside a station had been stopped by officers on the pavement outside a block of South London flats, MailOnline can reveal.

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