An investigation has been launched after a man was seen pleasuring himself on a train.

The man reportedly sat opposite a woman on a train from Clapham Junction. 

He then began pleasuring himself before leaving the train at Basingstoke.

The incident happened on January 30 at around 3.45pm.

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Detectives from British Transport Police (BTP) believe the man in the image may have information that could assist their investigation.

Anyone with information is asked to contact BTP by texting 61016 or calling 0800 40 50 40, quoting reference 351 of 30/01/23.

Alternatively, contact Crimestoppers anonymously on 0800 555 111.