Crystal Palace secured their place in next season's Premiership with a 1-0 win over East London rivals, West Ham. The only goal of the game was a penalty scored by The Eagles' Mile Jedinak.
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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.