A man in his 30s is in critical condition in hospital following an assault in a Norfolk town centre.
He was injured in an attack on King Street, in Thetford, at 7.45pm on Wednesday.
He was taken to Addenbrooke's Hospital with life-threatening head injuries.
A cordon was put in place while investigators were on scene.
A teenager has been arrested on suspicion of assault and has been taken to Wymondham Police Investigation Centre.
Anyone with information or who witnessed the incident is asked to contact Swaffham CID on 101 quoting crime reference 36/77863/23.
They can also contact Crimestoppers 100% anonymously on 0800 555 111 or at crimestoppers-uk.org.
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