- Two men in their 30s and a 15-year-old boy were arrested on suspicion of animal cruelty
- They were released on police bail until March 13
- Anyone with information which could help the investigation should call Surrey Police on 101
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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.
The pair filmed themselves clinging on as the train travelled from Essex to London at high speed.