Do you recognise these people (Credit: British Transport Police)
An elderly man was attacked during the incident which occurred just before 9pm on Sunday, 4 July.
During the journey, a man who was sat with two women said, ‘what are you looking at,’ before punching the victim in the side of the head.
The man and the two women then ran away into Stratford station.
CCTV images show three people who officers believe will have more information regarding the attack.
Do you recognise them? If you have any information, please contact BTP by texting 61016 or calling 0800 40 50 40 quoting reference 587 of 04/07/21.
Alternatively, you can call Crimestoppers anonymously on 0800 555 111.
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