Singer Emilie Sande has been nominated for four Brit Awards. It comes after a great year for the star which saw her perform at the opening and closing ceremonies of the London Olympics.
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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.