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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Scotland Yard said two murder investigations have been launched following the separate incidents, which both happened in the past week.
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The Met Police says 143 firearms have been handed in at stations across the capital in just seven days, including two antique machine guns.