Police are looking for a man who had a concrete slab smashed on the back of his head in Manchester city's downtown.
CCTV shows two men standing next to each other on Bloom Street with one man's arm on the shoulder of the victim. The victim turns to walk away, but is then hit in the back of the head with a concrete slab that was concealed in the back of the attacker's pants.
As the victim stumbles over towards the sidewalk, the attacker runs away and can be seen gesturing and yelling at the victim.
A suspect arrested on suspicion of assault shortly after the incident has been released on bail until September 2 as investigations are carried out.
Police have not yet been able to locate the victim and are worried he may have suffered head injuries.
Greater Manchester Police Detective Constable Tom Hornby said, "This 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."
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