Emergency services were called to North End at around 9.15am on July 12.
Police, paramedics, and London’s Air Ambulance attended the scene, where a man in his 40s was found with head injuries.
He was taken to hospital, where he remains in a critical condition.
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A man in his 30s has been arrested on suspicion of grievous bodily harm and is currently in custody.
A police cordon remains in place in North End as enquiries continue.
Anyone with information is urged to call 101, quoting reference 2456/12July.
