Do you know this man? (Image: BTP)
A man was seen "touching himself inappropriately" on a Northern Line train.
The incident took place on the London Underground between Tooting Broadway and Morden at around 8.30pm on October 4.
British Transport Police (BTP) officers have now released images of a man they would like to speak to in connection with the incident.
Anyone with information is asked to contact BTP by texting 61016 or by calling 0800 40 50 40, quoting reference 715 of October 4.
You can also contact Crimestoppers anonymously on 0800 555 111.
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