Teenager remains in hospital 11 days after fight outside Sunderland gym
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Police were alerted by the ambulance service following a report of a suspected assault, with the man arrested released under investigation as inquiries continue.
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Hide AdThe car park of the gym, which has been closed during the lockdown, was sealed off as investigations began.
A force spokesperson said: “It was reported that a 17-year-old male had suffered serious head injuries following a fight with another teenager believed to be known to him."
Anyone with information or who witnessed the incident is asked to contact Northumbria police via the Tell Us Something page of the force website or by calling 101 quoting log 885 191120.