France's Paul-Henri Mathieu has called ab early end to a second-round match at Wimbledon today when at 6-3 5-1 behind against Spain's Feliciano Lopez on Court 16 he also retired.
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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.