A man was punched unconscious in an apparently motiveless street attack.
The victim had walked past the two men in a Leicester street when he felt one of them tap him on the shoulder.
When he turned around one of the men punched him in the face twice.
The man lost consciousness and fell to the ground.
The victim spent several days at the Leicester Royal Infirmary being treated for a head injury.
The attack happened in Skipworth Street, off Evington Road, Highfields, Leicester at 9pm on Sunday, March 17.
Police released details and appealed for witnesses today.
Pc Charlotte King said: "This was a nasty and seemingly unprovoked assault which resulted in the victim having to undergo hospital treatment for his injuries.
"We are appealing for anyone who was in the area and remembers seeing anything suspicious or two men matching these descriptions to contact us."
The man who is believed to have thrown the punch is white, in his 30s, 6ft 3ins to 6ft 5ins and of muscular build.
The man who was with him is black, 5ft 10ins 6ft 1ins and of slim build.
One of the suspects was wearing a red coat.
Contact Pc King on 101 or Crimestoppers, which is anonymous, on 0800 555 111.
