Detectives investigating an assault in the Isle of Dogs have released an image of a man they wish to identify.
On 5 October 2017, police were called at 15:30hrs to reports of an assault on Harbour Exchange, E14.
The victim, a man in his 40s from Essex, was walking along the road when he was struck on the head with a weapon described as a dumbbell.
He received serious injuries including a cut to the head and partial loss of vision in one eye.
The victim was treated at the scene and taken to an east London hospital by the London Ambulance Service. He has since been released.
The suspect is described as a black man, aged approximately 20 years old, 6ft tall, of slim build with black hair, shaved at the sides. He was wearing grey trousers and a black top with white detail on both arms.
Detective Constable Sharon Etheridge, who is leading the investigation, said: "This was a vicious attack which appears to be totally unprovoked.
"The victim has been left with life changing injuries and I would urge anyone with information to get in touch."
Anyone with information is asked to contact Bethnal Green CID - Team Two on 020 8217 3719 or via 101. You can also tweet @MetCC.
Alternatively call Crimestoppers anonymously on 0800 555 111 or visit crimestoppers-uk.org