Westminster attack: Reaction

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An investigation is underway into how 52 year Khalid Masood killed three people and injured 50 when he drove a car into pedestrians near the Houses of Parliament. He then fatally stabbed PC Keith Palmer before being shot dead by police. Professor Tahir Abbas is a senior researcher at RUSI, a think tank which analyses International defence and security issues. In the following extract of a longer interview with BBC presenter Jona Kotnis he explains why attacks