The Met Police has said there was a smash and grab raid at the Selfridges store in Oxford Street tonight. 2 people were arrested shortly afterwards and the Met has denied reports that shots were fired.
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Paramedics were on standby outside the police cordon as armed officers stood by the property.
A team of researchers has taken samples from the ten busiest London Underground lines to work out which are the dirtiest.
The action comes on top of an emergency timetable which has seen hundreds of trains a day being axed.