A thug attacked a fellow passenger on a Brighton to Eastbourne bus.
Sussex Police said that officers wanted to identify a suspect caught on the bus’s security camera.
The force said: “Sussex Police would like to identify this man in connection with an assault in Brighton.
“A man was travelling on the number 12 bus towards Eastbourne around 3.30pm on Tuesday 5 June.
“While the bus was travelling between North Street and Maderia Drive, Brighton, the man was assaulted by the suspect, causing serious, but not life-threatening or changing, arm injuries.
“The suspect is described as a white man, of average build, in his mid-forties and with mousy brown hair.
“If you recognise this man or have any information on the incident, please report online or call 101 quoting 926 of 05/06.
“Alternatively, you can visit the Crimestoppers website or contact the independent charity anonymously on 0800 555111.”