Kew Gardens has been closed to the public "as a precaution" after a severe weather warning for London. It comes after a woman was killed by a falling branch on Sunday afternoon.
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.