Police have made a series of arrests over a smash-and-grab at Selfridges on Oxford Street in June. Dawn raids targeted addresses in Islington early this morning.
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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.