REMINDER A3 Clapham Road remains closed btwn Brixton Rd and Stockwell Rd due to the repair works being made to the burst water main.
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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.