The demolition of part of an east London terrace is due to get underway today after cracks in the building were spotted over the weekend.
Officials are hoping to save four flats and a restaurant in another section of the structure, but one other restaurant and three flats will be knocked down first.
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Police have stepped up patrols after a woman in her 40s was "dragged to the ground" in a park in east London.
Families living near Heathrow say they are supporting a group of activists facing jail for chaining themselves to the airport's runway.
Police were called to break up a "large fight" which involved a baseball bat, a man dislocating his shoulder and three arrests.