Crews are still at the scene of the Herne Hill flood. We're advising people to stay indoors until the electricity supply outside is isolated
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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.