Work has begun on a new indoor Jacobean theatre being built at the Globe. The Sam Wanamaker Theatre will open its doors in January 2014.
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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.