A woman was sexually assaulted by a flasher at a busy London Tube station. 

The incident took place at Bank underground station at around 3.20am on Saturday (June 15). 

The woman was approached by a man who attempted to assault her while his genitals were exposed. 

During the struggle the man snatched her phone from her hand, though she managed to get it back before getting away. 

The woman sustained injuries to her head, elbow and knee. 

British Transport Police (BTP) officers have now released an image of a man they believe has information that could assist their enquiries. 

Anyone who recognises him or has any information is asked to contact BTP by texting 61016 or by calling 0800 40 50 40, quoting reference 86 of June 15. 

You can also contact Crimestoppers anonymously on 0800 555 111.