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A man shot dead by police after he stabbed people in South London had recently been released from prison after serving a sentence for terrorism-related offences. Sudesh Amman was under active police surveillance at the time of the attack. Dr David Lowe, a former counter terrorist detective and now senior research fellow at Leeds Beckett University Law School, explains how police were operating. (Photo: Forensic officers in Streatham after a stabbing attack. Credit: Simon Dawson/Reuters)