Britain's Prime Minister Theresa May struck a defiant tone Thursday, in remarks to Parliament after a British man identified as Khalid Masood, 52, rammed his car into pedestrians near the British Parliament. Flowers with messages have been left at the scene in memory of the victims.
Britain Parliament Attack Aftermath

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Police officers search an area of Parliament Square the morning after an attack in London, Britain, March 23, 2017.

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Police forensic officers work in Parliament Square outside the Houses of Parliament in London, March 23, 2017.

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The property which was searched by police following yesterday's London attack, in Birmingham, England, March 23, 2017.

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Police outside a property in Birmingham, England, March 23, 2017, following an attack on Wednesday in London.