The convicted terrorist behind the Streatham attack was shot dead within "60 seconds" of launching a violent knife attack.
Sudesh Amman, 20, had been released from prison less than a fortnight ago was under active surveillance when the bloodshed happened.
As the Metropolitan Police's investigation progresses more details surrounding the counter-terrorism operation have come to light.
Armed officers, who were part of a proactive counter-terrorism surveillance operation relating to the attacker, were following him as he left an address in the Streatham area shortly after 1.20pm.
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