A pensioner has been killed in what appears to be a random attack at her home in Hornchurch. Police say the woman who lived in Platford Green, is believed to be in her 70s.
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Industrial vacuum cleaners and magnetic wands will be used each night during the summer to remove metal particles, dust, oil and grease.
Detective Superintendent Fiona McCormack said the Hotpoint FF175BP model had not been subject to any product recall.
Security for this year's event on July 8 has been reviewed following a spate of terror attacks in the capital.