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The number of victims from the attack outside parliament in London on Wednesday has risen to four following the death of a 75-year-old man.

As the attacker's identity is revealed what do we know about him and what could have driven him to do what he did?

Sir Francis Richards, former director of GCHQ and Sasha Havlicek, CEO of the Institue for Strategic Dialogue discuss how ‘low-tech’ terrorist attacks make the jobs of police and security forces more difficult.

Tariq Jahan, whose son was killed in the 2011 riots in Birmingham and Nusrat Ghani, MP for Wealden, discuss whether Birmingham has an issue with radicalisation.

(Image: Candles at London Attack vigil Credit: EPA )