An investigation's underway after a fire at a block of flats in Kensington last night (3 October).
20 residents had to be evacuated from the building after the blaze broke out in a penthouse in St Mary Abbot's Terrace near High Street Kensington.
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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.