A man was left in hospital after being viciously attacked close to his home.
Merseyside Police released a CCTV image of a man they believe may have information to aid the probe into the "nasty assault" which left the victim with a broken nose and two black eyes.
The victim, a man in his 50s, was ambushed close to his home in Waterloo.
The attacker set upon the man in Willoughby Road, first spitting in his face before punching his victim.
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A witness appeal has been launched into the street violence which happened around 3.40pm on Friday, November 27.
A Merseyside Police spokesperson said: "The victim was spat at by an unknown man before being hit in the face, resulting in two black eyes and a broken nose.
"As part of ongoing CCTV and witness enquiries, officers have issued an image and ask anyone who knows the man to come forward."
Detectives also appealed for the man pictured in the CCTV to come forward.
Inspector James Halpin said: “This was a nasty assault which left a man needing hospital treatment. He has understandably been left shaken and upset by this incident.
“We are keen to gather more information, and we believe the man pictured can help us establish what took place back in November.
“If you are the man pictured or you recognise him, if you witnessed the incident or have any information, please let us know."
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Anyone who recognises the males pictured or has any information is asked to contact @MerPolCC on Twitter, ‘Merseyside Police Contact Centre’ on Facebook or call 101 quoting reference 20000722155.
You can also contact the independent charity Crimestoppers anonymously, on 0800 555 111 or via their online form.