A pensioner killed by a stranger at her home in Hornchurch has been named locally as Rosemary Shearman. She was aged 72. Mrs Sherman's son, Greg, is believed to on his way to scene from his home in Wales. Her daughter lives in Hong Kong.
More top news
Scotland Yard said two murder investigations have been launched following the separate incidents, which both happened in the past week.
Photos show the extraordinary surgical procedures to remove the growth.
The Met Police says 143 firearms have been handed in at stations across the capital in just seven days, including two antique machine guns.