21 people were arrested after the Met Police carried a special operation overnight to target criminals travelling across London. Officers were deployed on six bridges to pull over suspect vehicles. They also used knife arches at three London stations.
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London and the worlds has united on Twitter in defiance of the West minster attack #prayforlondon #wearenotafraid
London was today a city of sirens and half mast flags in the wake of another terror attack.
MPs said they would "carry on" and go to work "as usual" in defiance of the terrorist attack outside the Palace of Westminster.