Londoners have told those responsible for the terror attack that today's events did not succeed in crushing their spirits and making them afraid.

A defiant trend has popped up on Twitter, as people commuting home and going about their business in the British capital in the wake of the attack tweeted "we are not afraid".

Many shared pictures of a Tube sign Photoshopped to display the hopeful slogan as people from London displayed their stiff upper lip on social media.

Five people are confirmed dead after a knife man attempted to strike fear into the heart of the capital in an attack which left a policeman among the casualties.

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Mark Rowley, Scotland Yard's top anti-terror officer, confirmed that 40 people were injured after the attacker, armed with two large knives, mowed down pedestrians with his car on Westminster Bridge then rushed at the gates in front of the Houses of Parliament, stabbing a policeman before he was shot by armed officers.