Officials said there was no evidence Masood had been radicalised in prison in 2003 and it was pure speculation to suggest that had happened

London attacker interested in jihad but no evidence of IS link, say police

Police said they may never know the motive behind last week's attack on the British Parliament that left four people dead

London attack: Police stumped as all but one suspect freed

A British-born convert to Islam, Masood had shown up on the periphery of previous terrorism investigations that brought him to the attention of Britain's MI5

London attacker was viewed by UK intel as a criminal with little threat

The Metropolitan Police released a new photograph of Khalid Masood. The mugshot had been taken for identity documents

London attacker was born Adrian Russell Ajao

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London attacker interested in jihad but no evidence of IS link, say police

London attack: Police stumped as all but one suspect freed

London attacker was viewed by UK intel as a criminal with little threat

London attacker was born Adrian Russell Ajao