Neighbours of eight year old Imani Green from Balham have spoken of their sorrow following the girl's death.
She was shot dead in the town of Duncans in Jamaica on Friday night.
One friend of the family said: "This is a close-knit community, so this is going to hurt us."
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.