A reveller who was smashed over the head with a piece of concrete in an unprovoked assault in Manchester city centre has been urged to come forward by police.
The incident occurred on Bloom Street shortly after 4.35am on Wednesday July 16 when the victim was attacked.
CCTV footage shows the man and attacker embracing before the offender pulls out a slab of concrete concealed in his trousers.
He then hits the victim on the back of the head before running off.
A man was later arrested on suspicion of assault and has been released on bail until September 2, pending further enquiries.
But police are now appealing for the victim to come forward, having left the area in a taxi following the attack.
He was taken to the junction of Anson Road and Dennison Road by the taxi driver.
Detective Constable Tom Hornby, said: “The footage clearly shows the offender smashing a concrete slab over the victim’s head with force while his back is turned.
“It was a cowardly and unprovoked assault and we desperately need to identify this man in order to check on his welfare.
“We also need to trace him because at this time we are effectively dealing with a victimless crime, which is clearly not the case.
“We need to take an account of what happened from him and record his injuries so we can properly and thoroughly investigate this matter and bring the offender to justice.
“If you are the person in the CCTV or one of the people he appears to be with or you know who they are, please contact us.”
The man is described as black, 25 to 30 years, of medium build and was wearing a white t-shirt, black top, jeans and black shoes.
Anyone with information is asked to call police on 0161 856 39597 or Crimestoppers, anonymously, on 0800 555 111.