Wandsworth police are appealing for witnesses after four 16-year-olds were attacked with wooden poles and a glass bottle in Southfields on Monday, February 1.
The group, three boys and one girl, were attacked by a gang of three men, aged 18 to 19, in an alleyway between West Hill and Jephtha Road at 6.20pm.
They were taken to hospital for treatment.
A Wandsworth police spokeswoman said: “The attackers were armed with two long, wooden poles and a glass bottle.”
Police said the men wore dark or grey hooded tops.
Anyone with information should call Wandsworth police on 020 8247 8770 or Crimestoppers anonymously on 0800 555 111.
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