Police are appealing for information after a 10-year-old boy fell from height in Ovingdean.
The boy was visiting Brighton & Hove and suffered serious injuries at about 5pm on Saturday September 24.
He was taken to St Georges Hospital in London by the air ambulance service, where he remains in a serious but stable condition.
A 52-year-old man from Oxfordshire was arrested on suspicion of allowing a child to come to serious physical harm and has been bailed until October whilst enquiries continue.
Anyone with information relevant to the incident is urged to report online or call 101, quoting Operation Chaucer.