The pavement erupted, sending a fireball into the air after a fault on the underground electricity network. 1, 867 customers were affected when power to the area was disrupted. All supplies were reconnected by engineers by yesterday afternoon.
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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.