Boris Johnson has provoked a bitter row over affordable housing after unveiling plans for a luxury floating village. The London mayor described the development in the Royal docks as a new 'Venice of the North'.
But Newham Council said the designer homes would be too expensive for local people.
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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.