Police believe this man may have made inappropriate comments to a young girl while travelling towards Prescot on a bus.
Detectives released this CCTV still following an incident on a 10B bus at about 3.40pm on Monday, September 22.
The incident happened while the bus was stopped outside the McDonald’s restaurant on Liverpool Road.
Det Sgt Paul Speight said: “We believe this man made some inappropriate comments to a young girl travelling on the bus and would like to speak to him to determine exactly what happened.
“I would like to appeal to the man shown in the picture, or anyone who recognises him, to get in touch with us.”
Anyone with information can call detectives on 0151 777 6571 or Crimestoppers, in confidence, on 0800 555 111.