Officers investigating an assault on board a train to Luton Airport Parkway have released this image in connection.
At around 3.20pm on Wednesday 3 June, the victim, who has mobility issues, asked a fellow passenger to move so he could sit down.
The man responded aggressively before placing his hand on the back of the victim’s head and lifting him by the throat.
Officers would like to speak to the man pictured, as they believe they may have information which could help their investigation.
Anyone who recognises him is asked to contact British Transport Police by texting 61016 or by calling 0800 40 50 40, quoting reference 439 of 3 June.
Information can also be given to Crimestoppers anonymously on 0800 555 111.
