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Sir Peter Fahy, chief constable of Greater Manchester Police, told the programme Abid Naseer should have been prosecuted in the UK.

Naseer was found guilty by a US court of being part of a trans-Atlantic al-Qaeda conspiracy.

Sir Peter said the necessity of early intervention into an investigation into a plot to blow up a Manchester shopping centre meant that the police were unable to gather all the evidence required for a conviction in the UK.

"When you're basing it on intelligence you actually have to intervene earlier when you are faced with what could have been an absolute tragedy," he said.