Enfield Council is trying to save one of London's oldest trees from dying. The 800 year old Minchenden Oak in Southgate dates from the time of the ancient Forest of Middlesex.
The tree has begun to subside and could pose a threat to nearby homes. It has extensive internal decay despite earlier attempts to stop it spreading.
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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.