British Transport Police investigating the assault of a member of staff at Nottingham railway station have released this image in connection.
At around 1.45pm on Wednesday 5 August, the staff member was sitting on platform 3 when a stranger walked past and struck them on the head.
Officers would like to speak to the man pictured, as he may have information that could assist the ongoing investigation.
Anyone who recognises him is asked to contact British Transport Police by texting 61016 or by calling 0800 40 50 40, quoting reference 362 of 5 August.
Information can also be given anonymously to Crimestoppers on 0800 555 111.
