A woman has been sexually assaulted on a train from Reading to Thatcham.
At around 11.40am on Monday, March 18, the victim was approached by a man who sat next to her on a train from Reading.
He began asking her personal questions and tried to grab her phone before becoming aggressive and sexually assaulting her.
Another passenger stepped in and the man walked away before leaving the service at Thatcham.
Officers believe the man in the images may have information that could help their investigation.
A British Transport Police spokesperson said: "Anyone who recognises him or has further information is asked to contact BTP by texting 61016 or by calling 0800 40 50 40, quoting reference 223 of 18 March.
"Alternatively, call Crimestoppers anonymously on 0800 555 111."
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