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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Flowers and messages are left near the scene of an attack by a man driving a car and weilding a knife left five people dead and dozens injured, in London, Britain, March 23, 2017.

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A police officer lays flowers on Whitehall around a photograph of police officer Keith Palmer who was killed in the March 22 terror attack in Westminster, near the Houses of the Parliament in central London on March 23, 2017.

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Britain's Prime Minister Theresa May leaves 10 Downing Street in London on her way to parliament, March 23, 2017, following the attack in London Wednesday.

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Police guard a cordon on the embankment with Britain's Houses of Parliament, left, in London, March 23, 2017, after attacks in London Wednesday.